Clarification: most of those targeted by CIC as seeking Canadian citizenship for a passport of convenience were deliberately engaged in the exploitation of the Canadian system in order to obtain the Canadian passport, and its benefits (convenience of international travel at the top of the list), with no intent to actually become an in fact citizen of Canada.
More than a few innocents have been swept asunder by sometimes draconian efforts to preclude (as much as possible) these who, make no mistake, leverage the letter of the law (and more than a few not bothering to do even that) to get the Canadian passport, which for many is more or less like obtaining a university degree, a rung on the career ladder.
The extent to which many were exploiting (or attempting to exploit) the Canadian immigration system in this way does not excuse or justify the hardships imposed on those who are legitimate immigrants in pursuit of a life in Canada. CIC holds a big share of the blame, along with those who have been disingenuous and fraudulent, for the abusively excessive timelines in processing and otherwise overly-intrusive impositions suffered by many sincere and genuine immigrants.
In the meantime, though, the SCCA, when it comes into force, will indeed make the path a lot longer and more demanding for everyone, and this is being done by the government largely to discourage those whose purpose is to exploit the Canadian system. Not only will it be imperfect, but it will disproportionately affect the legitimate immigrants. And that is regrettable. That said, for those who are coming with the hope and plan to actually become in-fact-citizens, the path will remain open and I am sure there will continue to be millions making this journey every decade.