P4 is my favourite, and it was also my introduction to the series (and Atlus games in general). I've since played P3P, P3 FES, P1, P2: Innocent Sin and P4: Golden (in that order), and I find P1 to be a real slog. I did not enjoy that game at all. Innocent Sin was good, but only because it's considerably shorter than most other Persona games.
I'd be glad if it happened, but obviously not at the expense of the games, if you get what I mean. Generally when companies try to get big, they "broaden" their games (i.e. cater them for a large niche of manchildren), and this how these games often "explode" in popularity.
I like the idea of Atlus doing well, but not if it means the games go downhill. Conversely, them doing well means more timely releases for those of us in Europe.