I think it could be possible that they would release a second modular in a year for two reasons. The popularity of the line, I don't have any official figures, but my general feeling is that these modulars are quite popular. Secondly, if they were to release half size modulars on 16x32 baseplates, like the two halves of the new pet shop buildings they would be cheaper and wouldn't take as long to develop, therefore being able to be released earlier than the once a year timescale we have at the moment.
Cafe Corner wasn't 'bad' but I see your point about already having something similar to a coffee shop. I don't think Lego would remake Cafe Corner, although it would be nice if they re-released it with an interior, because so many people missed out on buying it (including me).