Regarding the anticipated rush of applications based on meeting basic residence requirement
The anticipated rush of applications based on meeting the basic residence requirement without meeting the strict actual physical presence test, is among probable reasons for the government to give less, not more notice of when the revised version of section 5(1) in the Citizenship Act will come into force. This government tends to give minimal notice anyway, but this particular aspect illustrates that for many thousands of PRs, the timing of making their application will have a direct impact in whether they have to wait a year, up to two years, more before becoming eligible.
While the argument posed by nadeem bears positive weight in terms of why the CJ should consider making an exception (that is, it is a positive factor favouring the applicant deserving to be granted citizenship), under the current requirements, it does not have much if any weight regarding the critical element of establishing a centralized life in Canada.
Frankly, even before the trend for CIC and CJs to more consistently and strictly apply the actual physical presence test, my impression is that applicants relying on credit for time present in Canada before landing had difficulty (if not near impossibility for any significant shortfall) of being approved based on a centralized life in Canada test, rather than the physical presence (1095+ days) test.
After all, it is hard to prove having centralized one's life in a place during a period of time the individual was in that place with only temporary status. And prior to landing, that is the nature of an individual's status: it was temporary.
Parliament has now spoken (by adopting Bill C-24) that its preference is (1) not to give credit for time in Canada with temporary status, and (2) to require actual physical presence. Even though these are not technically applicable to anyone whose application is received at CIC the day before the new provisions come into force, the predominant test being applied these days is the actual physical presence test. Thus, it is apparent that the odds now are very high against an applicant relying on pre-landing credit plus having a shortfall and thus also relying on a CJ to, in effect, waive applying the actual physical presence test.
That does not necessarily mean it is not worth trying. That is a personal decision. That depends on just how close to the 1095 days of actual presence threshold the PR comes. That depends on how well established the PR's life in Canada is. And it depends on how much longer the PR would have to wait before becoming eligible under the 4/6 rule. Way, way too many variables to attempt outlining probable scenarios, but of course it will be worth comparing how long one has to wait to be eligible under the new provision versus how much longer processing is likely to take (and at the risk of a negative outcome) applying with a shortfall case under the current provision. This will a very individual calculation.
The problem, for those trying to decide if or when to apply, is that it is a bit of a cat-and-mouse scenario leading up to the coming into force of the 4/6 rule: how much notice will there be and, most significantly, what the actual coming into force date will be. This is why so many are following every hint of news about the prospective date: it will make a big difference to many, many thousands of PRs (could easily affect well over a hundred thousand, perhaps as many as a quarter million).
Reminder: for those who have a shortfall due to extensive absences since landing, but landed significantly over three years ago (and particularly those who landed more than four years ago), remember that once the new provision takes effect, the period of time considered expands to six years and the required ratio of time in Canada to outside Canada is more lenient (2/3 as opposed to current 3/4). For those who have had extensive absences due to work abroad (long haul truckers with routes in the U.S. for example; some off-shore oil rig workers, among other examples), or due to a particular contingency (having to spend several months attending to an ill parent in the home country for example), and as a result have spent more than one-fourth of their time abroad in the last four years, it will be worth re-calculating actual presence under the new provision . . . in short, as of the day the new provision takes effect, there will be a large number of PRs in Canada who have failed to meet the 3 years in 4 presence requirement who will suddenly be qualified based on presence for 1460 days (4 years total) in the last six years.