I don't think they would "lose out" if they were to ever make a Jazz game in a sidescrolling platform style with updated graphics and such. Look at Sonic (ok, even if you don't like the newer games) he's still getting 2D games and people seem to care more about that than the 3D Sonic because the Genesis/Megadrive games are truly what made him popular. To be honest that would be the best way to revive Jazz. Better graphics, new characters and a better online system etc. (or I could bore you with even more ideas which I don't want to do..)