I dunno … in the sufficiently long term, it might gradually evolve in that direction. Hybrids seem to be doing OK. The various Harvest Moon games have done okay, and Persona 3/4 have been the most successful MegaTen games ever. But both of those have pretty hefty RPGs attached to them, and Sakura Taisen is much lighter on those elements. There’s the possibility for hybrid games to gradually become less RPG and more dating sim, and still be successful. Fifteen years ago, RPGs were a pretty crappy market; FF7 changed that.
But ultimately, NIS America rolled the dice on Sakura Taisen - a series that has been in much demand by RPG fans pretty much since the first games came out - and they didn’t quite come up with snake eyes, but it failed. That is going to be a very heavy blow.
There’s the possibility that ST5 was simply too old at this point; or that something about it hampered its appeal. Another of its ilk might be successful where it wasn’t. Problem is, it’s a losing proposition. There’s a track record of crashing and burning, and publishing costs tons of money. Exhaustively trying all the variants of a game that failed in an effort to find the one that will be a hit is a good way to go broke. If something isn’t working, then you go try something that IS working. When sword and sandal epics stopped pulling audiences into the theatres, they went the way of the dodo. Movie studios haven’t tried to resurrect them. Or musicals either.
(Of course, there are exceptions to this. The Conduit recently got a sequel. I’m not entirely sure how, or why.)