I'm not exactly in the Yorkville scene, but there is surely activity here after 8pm. True, not on Bloor as such, since there aren't many restaurants - only retail shopping that dies down. However, stroll over to Yorkville, or the Church area, and there is plenty going on.
I think that this building is just a symbol for the new Bloor/Yonge - there are at least 17 proposals in the vicinity right now(North of Church, West of Jarvis, South of Davenport, East of Avenue/University)! Along with the Entertainment district, this is the densest cluster of new condos in the city - the people will follow.