It's a pity that it takes a crossover for a series that used to be successful to show it's face in public again. Of course after the apparently terrible dungeon crawler and then the glitchy PS2 games, maybe it was for the best.
I doubt we will see a major iteration any time soon. I cant recall a sakura game that hasnt been panned since 4. The remakes were allegedly bad and they underperformed, and the the Sakura Universe didnt fare much better. Cancelled or garbage. Theres also the issue of over saturation. They released an ass-ton of Sakura games on the PS2, mostly remakes and spinoffs. If Sega does make a new ST game, it'll likely be a spinoff or some subplot that's viewed with skepticism and then apathy.
I read a poll a few years back. I think it was in famitsu, and they were asking gamers which series they wanted to see make a comeback the most. Sakura Taisen came second, and this was just months after th DS dungeon crawler came out and sold, what, 50,000 units? Half what Sakura Taisen Tetris was pulling on the Saturn?
We will probably get a mediocre 3DS "reboot" instead, like Shinobi. It's sort of sad that Sega doesn't seem to have the time for it's own series anymore, speaking of Shinobi. It almost feels like Sega wants the games to fail. Who tests the waters with something like the Shinobi or Golden Axe or (going further back) Vectorman or Altered Beast. Sorry to go off topic a bit.