I don't know about that Javaville location- Lettieri tried it a while back, and I think 2 (at least 1) other coffeee/ light food establishment has come and gone from that spot. One would think it's a good location (corner, southern exposure/ good light, lots of people walking by) but I've been passing that corner regularly since 1994, and it seems like a surprisingly unlucky spot.
It reminds me of a Toronto Life feature, maybe from a decade ago already, describing about 10 unlikely real-estate 'dogs' in the downtown core- actually, I'd be curious to re-read that article and compare their locations to what is happening with those properties today. To conclude on a more optimistic note, for instance, there is a coffee shop on Harbord around Grace (north east corner) which looks decent and seems to have regular customers, even though that strip never had much pedestrian traffic.