I think it's difficult for this city to support two Chinatowns in the general core area. The older, smaller one is bound to start declining, just like the chinatowns before that (ie: the old Dundas & Bay / University Ave. Chinatown), though that one was probably "pushed out" by development rather than financially dying.
Additionally, it's Spadina that gets all the attention and tourists, not many even know an East Chinatown exists and with it's proximity to the suburb of Scarborough, well it doesn't stand much chance. I also don't think it's as convenient to get to via TTC as the main Chinatown.
However, the article is good at telling you that stuff is cheap there.. I might just have to check it out now.