That's because SNKP is not like the other companies
Im impressed that at this point, lots of fans doesn't realize than SNKP is an incredible small company, the fact that they still managed to release XII and XIII still blows my mind, at some point KOF XII producer explained how all the compilations (And the DS semi hentai game lol) were necessary to produce games like KOF XII and XIII, because those games had an small cost, and still generate revenue because SNK hardcore fans are very loyal to the company (and lol, lots of times I bought them because I played them free always, so it's like, ''well, now I had the game legally, so, big deal)
Expecting than SNKP release another franchise than isn't KOF at this point is very delusional (hell, at this point we entered to territory that maybe expecting another KOF is delusional)
At this point the only hope than SNKP has to release something new is to expect to had a game that got some revenue, in theory XIII should be that game, but we don't know where's the company now