I have no living experience in Canada and my spouse has been abroad for about 8 years before we got married.
would it be a problem if my citizen spouse sponsors me and we continue living abroad for say 15 years and finally settle in Canada permanently? We have definite plans to return with our citizen son eventually for his college education and beyond, we just do not know when we would leave for Canada and having a PR beforehand will make things more certain and convenient compared to waiting 1.5 years with possible separation from family or inability to have the legal right to work.
Having been in this situation a bit: you really need to be more precise about
why exactly you wish to acquire PR status so long in advance of actually settling. Perhaps there are situations in which it would make some sense. But there are disadvantages as well - and in my view, relatively few advantages.
To put it simply: PR status is
not intended for those who are not living in Canada. The requirements are 'light' (two years in five within Canada) compared to other countries, but it really is not intended for your case - and disadvantages will come up.
Compare this to: if residing abroad, apply for a TRV (making it clear your spouse resides abroad i.e. your familiy unit ties abroad are stronger). IRCC commonly now issues TRVs with validity of up to ten years (or passport validity). Come and visit basically as mch as you want. Down the road, in advance of when you wish to apply for PR status, decide whether you wish to do it from within Canada or outside (inside disadvantage is you won't be able to work until complete). Note also that if you apply whle Canadian citizen sponsor is abroad, will need to show intent to return. In short, you can use time from now to prepare (including using visits to Canada to prepare to show the intent to return, like spouse maintaining some bank accounts and whatnot).
Advantages of getting PR way, way in advance - well, you can enter Canada without a visa. Not a big advantage since you can get a TRV with
longer tenor than a PR card. Also you can visit some (very few) other countries with a Canadian PR card (visa waiver) - again, only as long as your PR card is valid. That really is about it.
You can apply in advance. Personally I would say applying up to two years in advance of when you expect to permanently move is fine. (With a few small caveats).
Disadvantages of applying well in advance:
-Every time you enter Canada, the issue will be whether you are actually residing in Canada. More questions if not, as a PR.
-First and foremost, you will constantly have the issue of resdiency obligation (two in five) coming up. Quite possibly leading to hearings and bureaucratic hassles and whatnot.
-You
may be able to get IRCC to accept that you are accompanying spouse - but quite possibly not. The PR status doesn't guarantee anything and you can't get it approved in advance. (My gut reaction is that your case would have a somewhat-higher prob of being rejected as accompanying - but only a guess).
-If for whatever reason down the road you should lose PR status (because
not living in Canada and hence not meeting residency obligation), your spouse can apply to sponsor you again. But if that happens, you should very much expect that IRCC will
not accept at face value the 'intent to return' (because you and spouse did not honour previous obligations). And if that happens, there may be no practical solution except to be separated anyway.
-Expect other inconveniences and hassles - some less serious, some more serious.
As an example: my spouse immigrated independently (before we met) and then 'life happened' and she did not remain. Fast forward many years, she renounced, we visited many times, eventually planned our move and applied roughly a year in advance of when we'd planned to move. Covid happened, file was a bit slow, and effectively our move got delayed to the following summer (inconvenient but not the end of the world - although in retrospect should have applied eg six months before). [Note our PR app was only a month or two later than we'd
roughly planned for, with some buffer - just that covid restrictions and issues and school requirements were a serious issue and buffer was not enough - in normal times would have all been fine.] As a couple married for many years, residing together, etc., and having planned our move, the file went smoothly (save covid).
BUT: every time we've travelled my spouse has to go through secondary inspection at passport control. The CBSA officers are up-front, it's because of the previous immigration file/resdiency obligation. I had hoped that now having re-qualified as a PR, under completely different circumstances, 10++ years later, this would stop; recently we were told by CBSA that the flag on the file would remain until she became a citizen. It's not a big deal - but if travelling a lot or when airport is busy and/or with kids, it is an added annoyance (and believe me, in covid times, any added annoyance brings us all one step closer to total frustration.) Anyway my point being these minor 'notes to file' because of issues can hang around for a long time.
It is up to you in the end. But I would seriously think carefully about this before going ahead. Take your time and prepare. It is more advantageous to apply closer to the time you expect to move permanently.