Who's "we"?
Because, y'know, I could not give less of a fuck about Fujin or Tremor, and I'd only play Tanya if she was decent/fun to use.
And Storms, if it makes you feel any better, there are two likely outcomes for the Vita version of MK9:
1) MK9 for the Vita is bound to have some kind of bonus content to rake in people who own MK9 but don't give a fuck about having it on a handheld for its own sake, so it may be a character.
2) If it IS a character and it isn't something retarded like a Sony exclusive (or even something as specific as a Vita exclusive), they'll more than likely be released as DLC for the consoles. Think Blazblue, where there were three DLC characters released for the console and the PSP exclusive just added them to the base roster. This would probably be like that, and it could mean one more season of DLC characters with the Vita exclusive being that they'll be included for free. I mean, it'd give them another piece of DLC for the consoles without actually needing to release anything new just for a Vita exclusive, so it'd make sense, right?
Keep your fingers crossed, man. I would be surprised if Shinnok gets added to either version unless the Vita continues the story, though. I wouldn't mind it since I've always thought Shinnok was pretty cool, but it seems unlikely to me, as Boon's openly stated that Shinnok is "always on and off the DLC list". You never know, though.
In either case, it's best that we all just remain cautiously optimistic until we know what's up.