Great points. I completely agree. I have nothing inherently against skyscrapers and I support this project, assuming it looks a little better than these line drawings suggest. That said, I think we're making a big mistake in assuming that skyscrapers are necessary for any great "urban" neighbourhood. I live in New York and I can tell you that many of the most popular, exciting, dynamic, and, yes, urban neighbourhoods are the ones that have no skyscrapers at all. Nobody goes to have fun and enjoy themselves among the skyscrapers of Park Avenue. Times Square is mostly tourists. The Lower East Side, East Village, Chinatown, West Village, Soho, etc. are all low rise neighbourhoods. In fact, people would be horrified at the idea of building a mass of glassy condo skyscrapers in any of them. Sure, there are a couple of towers you can point to, but it's nothing like what we're building in Toronto and they're almost never demolishing older buildings to do it.
I'd say that Queen West, the Danforth, Kensington Market, Saint-Laurent, Byward Market, etc. are all just as urban as, if not much more so than, condo skyscraper neighbourhoods like Bay and Wellesley, and Cityplace.
On the other hand, I really don't get these firm height limits like 137m at a location like this. As I said before, I don't really see the difference in impacts between a 45-floor building and a 60-floor one.