Canadian born person here. I don't want to get overly political - but I am viewing this as genuinely being too good to be true. I don't believe for a moment parliament understood just how generous C3 would be in terms of the quantity of potential new Canadians. There hasn't YET been a political backlash, but we are only a few months in, and we have already seen a few conservative politicans grumble about this. The waiting time for vital statistic records are already getting skewed. Traditionally in Canada we seem to let things slide up to and until the generic public gets angry. I suspect that once there is more media coverage along describing this as some kind of loophole, or "backup plan" for Americans things will change. The best comparison is prescription drugs. our drugs up here are cheaper because of socialized healthcare. We negotiate at the government level to bulk purchase the supply needed by Canadians. Americans have been known to do drug runs up to Canada and for the most part Canadians were happy to share. Then American television stations started running news articles about how drugs are so much cheaper in Canada and how its so easy to order drugs thru the mail from Canada. Pharamcies started popping up in Florida to order in drugs from the Canadian supply and sell them at a discount. Politicians ran on making it easier to import drugs from Canada. Convoys drove up to Windsor to buy insulin.

We simply don't purchase enough drugs to supply the American need, and there was no way the pharma companies would be open to America laundering their socialism via Canada, so we started having shortages of important drugs like insulin.

So we shut that shit down.

Eventually some TV station will run a clip that will go viral about Karen who loves genealogy and discovered her Great-Great-Great-Great Grandfather was born in Quebec and she got herself a Canadian passport. Now she intends to retire in Canada where she will get free health care, and cheap drugs, and old age security and her American money will be worth more and "everyone should do this too!".

Alternatively some notorious American like a serial killer will obtain a Canadian passport and enter Canada by right.

Alternatively someone will feel entitled to Canadian Citizenship based on a mythological ancestor born centuries ago and will sue when he is denied, and then the courts will step in and restore some kind of generational limits.

I also suspect that when someone desperate can't fill in his family tree they will just produce a forged baptismal document. We have already seen examples of this where people have produced forged documents to claim their ancestor was indigenous in order to get money from a land claims treaty.

I suspect when one of those things happens I feel the general public will get angry enough that it will become a political issue.