I don't think he is the only factor stopping a new Darkstalker being made.
The series outside of Morrigan & maybe some of the other female Darkstalkers is still too niche to really gather a audience worth making a new game unless they went really hard marketing wise. That and more importantly, peoples at Capcom need to be passionate about making a new DS game, knowing all the problems they're going to face if they want to make one.
But hey, Metroid Dread is almost here, so who know what the future could hold.