Nobody but a select group of nerds comes to Toronto to gawk at tall towers. People do come to Toronto to experience vibrant streets and neighbourhoods. In this sense King west here isn't lacking anything that some upgraded tenants and better theatre programming wouldn't fix. Even at its worst, the Royal Alex, The POW, RTH, the Festival Tower, Restaurant Row etc make this a very dynamic and successfully urban area. Towers overhead will not hurt this, to be sure, but busting a block just may (quibble over your own effin' definitions, by the way, I get what Neubilder means!).
Mirvish the reluctant impresario with a daddy complexe wants to build statues and show off his art? Fine, but why not do it in a way that sympathetically adds to what already exists, a strategy that is working very well all over Toronto? Other than selfishly wanting a 'pure' Gehry is there any single credible reason why integration wouldn't be preferred to destruction?