Well having some Japanese players might or not help the EVO scene. Don't think it will have a very big impact from a foreigner point of view (my 2cents view). Of course they might showcase alot of high level play but I think you guys have people who can showcase that too, not on the same level but close.
On top of that, not everyone knows what the hell is MBAA much less the players from Japan. Keeping the hype alive at EVO will still be the most important thing I guess. There is a EVO APEC which is EVO Asia Pacific held in Sydney, Australia for people around the region to participate. Currently the game which they are hosting is SSF4, the champion of the tourney will be sponsored to fly over to Vegas free and seeded thru the prelim rounds. So maybe pray hard they might include MBAA too, but my hopes ain't too high for it to happen, pray for the best only.