Yes, I've never actually read an article comparing the economic scenarios of increasing population vs. decreasing population. Every article I have ever read about the future population of Canada, or any other country, starts with the assumption that the population must grow to pay for the aging population, but this assumption is never explored. To me, it just seems like a grand pyramid scheme.
Yes, I can see the downside of slow depopulation, however on the other side positives, cheaper housing, less urban sprawl, stronger community, better employment balance as we move towards massive automation....etc.

Now that would be an article I would love to read.