Trenton? LOL I'll give you Hartford or New Haven or Richmond VA, or a slightly watered down version of Cincy or Oakland but even with the lack of housing and folks on the street last I checked there aren't many office high rises/skyscrapers in Downtown Trenton, especially new ones.
As far as housing, there's smaller, market rate lofts up and down Market Street between Mulberry and Broad, with more coming. There wouldn't be a 7-Eleven or Krausers within the vicinity if not for them. The problem is the lack of "big" projects, and the ones that are on the verge of getting built are on the other side of downtown near NJPAC and not within walking distance(One Theatre Square, One Riverview, and I guess the Hahne building), and the ones that are within walking distance are years away, like this:
http://www.rbhgrp.com/four-corners.html
This isn't the first time the arena's been dim this part of the year apart from sports. Even in the VBK years they had duds. Agree mgmt needs to do a better job at promotions but bear in mind they've been doing some renovations this summer(specifically clubs). When the events calendar doesn't change by the end of the year I would worry.