Hexblade really provides one of the coolest, most interesting playstyles in the game.
+1000 to this

Fixing the pact of the blade, adding CHA mod to it, I think that would already go a long ways into making it viable without the need for hexblade, the Fiend and the Fae pacts have some features that would be cool for mellee, if melee was based on our main stat, CHA.

Whatever choice they make, they must add the invocations that improve the pact weapon from Xanathar. Except the "you can also use a ranged weapon as your pact weapon", IMO, that's unecessary. If I wanted to be a ranged warlock, I'd go for the eldritch blast maniac.