Everyone rolls out the standard argument that massive immigration is necessary to counter the "demographic challenge" of fewer young people, caused by a lower birthrate. What few appear to take into the account is the very strong likelihood of revolutionary new technologies based on artificial intelligence that could wipe out entire categories of jobs relatively quickly. This isn't science fiction -- self-driving vehicles, for example, are already being tested, so how long until they are ubiquitous on our streets? And some 400,000 Canadians are employed driving vehicles of one sort or another for their livelihood. And the same process will be underway in other fields -- some of them which now employ many tens of thousands of people in Canada. Yes, the economy has always created new jobs, but it is far from clear that it will be able to create jobs in those numbers, in a short period - especially when many of the displaced workers will not be particularly high-skilled.