I agree with this sentiment. Expand GO-RER in Hamilton and fully build out the LRT network and things will get real interesting for that city quick. Unlike other municipalities in the region, Hamilton's street grid and build form are ideal for urban rejuvenation.The CBC article was silly clickbait. However, the underlying notion is an interesting one. Hamilton is not Brooklyn (anymore than Toronto is Manhattan), but it would be interesting to see Hamilton grow into a similar role (more so than it is today). Hamilton has a lot to offer: good urban bones, some good architecture, more character than a lot of the 905 sprawl, home to a good university and other amenities, etc. Young professionals, artists, etc. forced by high housing costs in Toronto to move to post-industrial Hamilton, but nonetheless having decent transit access (RER) to the big city -- I just think that's something that's beneficial to Hamilton, beneficial to Toronto, and makes the overall Golden Horseshoe region more interesting.
I don't know about the Brooklyn comparison, but I definitely think there is something to be said about having a competitive 'sister city' to compete with Toronto and keep us on our toes. This relationship is best played out in the Twin Cities (Minneapolis-Saint Pauls) in Minnesota, where both cities actively try to out-compete each other, resulting in innovation and economic development of both.
We in Toronto should be encouraging Hamilton's (and K-W) initiatives to become more competitive. It will benefit our region and our city both economically and competitively in the long run. We already are seeing this first hand as Hamilton's bike share program is already far superior to Toronto's, and Toronto would do well to adopt Hamilton's bike sharing model.