I still love the idea of a spiritual successor to SvC called “The King of Street Fighters” focusing on specifically crossing over the KoF shared universe (Fatal Fury, Art of Fighting, Psycho Soldier, Ikari Warriors, and King of Fighters OCs) and the Street Fighter shared universe (Street Fighter, Final Fight, Rival Schools, Slam Masters, and… something else to make it equal in number to the SNK side).
They can still do a game actually called Capcom vs SNK or SNK vs Capcom, but that should follow the precedent set by modern vs. Series games with lots of characters beyond those shared universes and fighting games. Then, with both games existing, both niches can be filled.