Damn dude. That's a nice pic. Yours? If they did any fighter in that style then sign me up. I voted for Last Blade. I like the gameplay (aside from broken shit) and I think it's a pretty unique weapon fighter, and would probably be the most successful for them if done right. Know what I mean? If they tweak it just right, players of equal skill can do well if they play it at a slower pace and know how to use parries, and players that like a faster pace can get into it too.
Honorable mention to Art of Fighting, but I don't think it will happen. It was never a huge franchise like Fatal Fury, Samurai Shodown, and of course KOF. I'd like to see them develop a fighter with similar mechanics to AOF; and by that I mean using Taunts to drain opponents special meter, special moves costing meter, and charging meter. Those elements really make the first two AOF stand out from the rest.
What I think would be their biggest success is to consider updating the Fatal Fury series but in a dream match way. Fix some of the bugs from the Garou system and add some other things form the previous games and you have the makings of a game people would love to death.
I could go for that, but I don't think JD should be in it. And when you take away JD you remove everything Garou had going for it (aside from the removal of the 'slide'). I think a new FF modeled more on Real Bout 2 could work really well. I also hate the poke priority in Garou.