I think you guys are making a mistake -- a citizenship application is not part of the PR process. When I applied for PR, there was no blurb saying "And after you've been a PR for 3 years, then you can apply for citizenship." It's no different from immigrating to Canada as a nurse, and then finding that after landing the language requirements change before you finish the registration process.
The contract of being a PR is this: permanent residency, the right to live and receive all the benefits of a citizen, with a few exceptions (voting, military, extended periods abroad). The contract includes the right to apply for citizenship under whatever statutory law is active, but it doesn't say that law cannot be changed. Canadians will always be refining the terms on which non-Canadians become Canadian. It would be nice if they would implement these regs gradually, but I really doubt that is in the works. Somehow I don't get the idea this government works that way.
As for the issue of changing the goal posts in the middle of the process, when should it be done? It will always be the 'middle' for some people, if you look at it as a single process (which it isn't).
I agree with you guys that it sucks for people who are counting on getting citizenship as fast as possible -- but this was never a promise, and citizenship is a separate process from PR. I'm thankful that there is no political movement to REALLY increase the residential requirement (assuming that doesn't happen in the next two weeks). I'm sad that it looks like there's a pretty good chance (this kind of thing has been promised for a long time now) I won't be able to apply in November; but at the same time, if they get their process fixed, waiting another year to apply under a fast and efficient process might be better than applying right away with the current process. You don't always get what you want, but you might find sometime you get what you need.