That will not make sense at all. People can still enter back into Canada using CoPR, passport and driving license.
They would/could eventually lose PR status in Canada.
My opinion on this has always been this : When it comes to Canada, one should not be more canadian than canadian citizens themself. If Canadian citizens for many decades have been working in USA legally and making almost daily day trip, it should not be beholden on immigrants to not do that, so long they are in clear of law. Follow the law but make use of all the opportunities that come your way.
Canada gave you PR based on their own calculation of benefits. If you are not earning enough, you are not doing anyone any favour. Infact quite the opposite. Earn money, as much as possible, as fast as possible. Pay your share of taxes (again, go back to the point of remaining in clear of law) and Canada should have ZERO issues with you.
My impression is that you're not talking about the same thing (although I haven't followed the thread in 100% detail, so if I've misconstrued your point, mea culpa).
Overall I think the point being made above is that the combination of several immigration aspects in Canada has resulted in / can lead to a lot of immigration that is specifically targetting acquiring Canadian citizenship
in order to acquire the passport and leave Canada - basically permanently. Those aspects are (in combination) lack of requirement to reside in Canada while citizenship is being processed*, relatively short residency requirement for citizenship (compared to most other countries), inclusion of time in Canada before becoming a PR (arguable this), and some of the education mills/temporary foreign worker programs (also arguable).
Of course, it's a fact of life for Canada that some 'leakage' of Canadians citizens and PRs to the USA and other countries is unavoidable in the modern world. Reasonable people can disagree on whether it's in Canada's interests to grant them citizenship more quickly (which does provide better/faster access to US immigration).
Your social contract with Canada as an immigrant is to follow law, value Canadian values (though, those are typically not very clear and often redefined by politicians to whatever is expedient), contribute to prosperity of Canada in process of forwarding your own prosperity, when possible support your local community and if a war break out, be ready to fight for Canada if you are a citizen.
Realistically, once a citizen, none of the last three are realistic requirements.
So again: should not be controversial that some (many? idk) will feel that granting citizenship too quickly can result in part of the social contract is not being honoured - if, at least, it encourages immigration to Canada / acquisition of citizenship
in order to leave Canada and not to remain.
[I think I'm pretty liberal on immigration and pro-immigration - I favour both of them. But I'm concerned about this aspect, because I see it appears to be happening a lot, judging by - for example - the number of citizenship apps on this forum from those no longer living in Canada.]