You know, besides not having access to updates, I don't mind the PS2 release. It makes more sense than a PS3/360 release when it's only for JP. If it were being released in the US like SF4 and BB, then PS3/360 makes more sense, but as it is, there's not much reason to make it not PS2 when more people have PS2s.
Also, if you really care about playing it on a PC, PS2 emulation actually works, as opposed to Naomi still not being fully emulated? A lot of people who play MBAC I can tell don't have PS3s or 360s, and unlike with BB or SF4, it's almost definitely not going to be a commonly played game regardless, so you can't just go to your friend's place and expect them to have it like you can with SF4.
That said, while I don't oppose a PS2 release, I know for a fact there will be people who are going to be out of it without a real choice (although this is very likely with PS3/360 too because of imports regardless). I don't have a PS2, PS3, or 360, and there is 0 chance I will ever get one. Hell, if I won one from some contest, I would have to give it away to someone. That's just how it's been with me as far as real gaming goes since I was in elementary school, and it's going to be that way until I'm completely unreliant on my parent's money or a place to live (which means I have to pay off all the money they borrowed to pay for my college back to them as well). If I even thought of traveling for any sort of gaming event, I'd probably be disowned. It's the reason I've lived in Houston my whole life and never been to P-Z, but I go to UFO since I'm living in a dorm in Austin.
Masu is a new player who will travel for the game. That's a blessing. I don't think a lot of people can say that, and not just because of laziness, though definitely there are people too lazy to travel and don't want to save up the money. I speak for only myself, but I have a feeling there are other people in the same boat as me. I simply am unable to travel for Melty, and no matter how much I'd like to, I don't have a choice. Whether or not people like me matter at all for the community is debatable, but there are definitely a number of people who, regardless of liking the game enough to be willing to travel, won't ever really play the game outside of netplay because they can't travel.