I think there's still room for a Hexblade patron, at least conceptually...
The biggest problem with the Hexblade as presently designed is that it was always a patch job for the '14 PHB Blade Pact first and foremost, so with them fixing Blade Pact for the '24 PHB, it seems like significant chunks of the Hexblade's core kit are being rendered obsolete.
But I think the "hexes, curses, and dark Shadowfell magic" angle is still one that can serve quite well as a foundation, and more importantly, one that could likely be retooled to serve all Pacts equally well, rather than essentially forcing the choice of Blade Pact by default.
Maybe give the Hexblade a new name if the "blade" part is now more explicitly optional, but I think it can still work.