First of all what ever I am stating below is not personally for you. I am just trying to make my point and debate. So @ AnonymousB, please don't take it personally.
You are free to leave after completing 1095 days requirement. Nobody can stop you. Legally you have a right to acquire the citizenship.
But having said that there are lots of other issues at play. If you are lucky and you don't get and RQ and your whole application process gets completed within 3 years time frame, you can obtain citizenship without any problem. I know and heard about a lot of people who have got that way in the past. That is "in the past". The current normal time of processing is 21 months. Since CIC is using a lot of its resources and time in combating fraudulent cases, that time is likely to increase. I believe CIC updates that once a year. CIC considers data from April 1 to March 31 every year.
If you get an RQ, that can increase your application duration by another 1.5 to 2 years. So it is very likely that the total length of application will go beyond 3 years.
One of the requirement for citizenship oath is that your permanent residency status should not be in any sort of doubt on the day of oath. Keep in mind, it is the permanent residency status. It has nothing to do with the PR card status.
So if you stay outside for more than 3 years in the last 5 years and enter Canada, the immigration officer will give you an option to voluntarily surrender permanent residency status or initiate a process to determine permanent residency status. You will still be allowed to enter to Canada and defend your case. But you will not be allowed to take an oath until your permanent residency status is finalized.
AnonymousB said:
There are a lot of negative, angry and jealous people here...
I doubt about people being jealous. It is very likely most people in the forum don't know you or any other people who leave after 3 years. So there is not point of being jealous. Bill gates has billions of dollars. Is there any point in being jealous of him? But angry? Yes. I think that is possible. How would you feel if some bum relative of your spouse comes and live in your house and eat food from your refrigerator? You pay for the house, you pay for the gas, electric bill and food. But your that good for nothing relative does not go looking for job and stays at your home watching TV and playing your XBox all day after getting fired from his job. IMO, that is what people are angry about. Their hard earned taxes going to opportunists.
I am sure if you leave and be a multimillionaire, it is unlikely you will come back to exploit Canadian welfare system funded by taxpayers. In that case, people won't care. There are many Canadians who become a huge star in Hollywood or successful in Wall Street. People have no problem with them. Actually people like that. It will boost Canada's profile. But most people in the forum and most Canadians in general are not happy about people who don't contribute with taxes but will potentially take advantage of Canadian's welfare system when they get in trouble.
I personally know one immigrant family where the parents are unhappy with CIC making it harder to bring parents and grandparents. But their son is happy that CIC is getting tough. He hates the idea that there is one taxpayer paying in to the system and withdrawing for four to support parents and grandparents.
And about negative, the forum members are stating what is the worst that can happen. But if you are willing to test your luck, you are free to do so. This is a free country.
Again @ AnonymousB, please don't take it personally. I don't mean it to you. I am just arguing my case as in a debate.