No and yes. Ice knife would be pretty busted, actually, for a cantrip. It's actually in an okay place, it's a first level blast that does mediocre damage and has a small AOE, putting it on par with other first level blasts. It's on some spell sheets that other blasts aren't.
Witch bolt can't be saved unless you just remake the entire spell and abandon all the current trappings. Concentration for reactivated single target damage is a mediocre strategy to begin with, and any further limitations (can't switch target, can't move, damage is awful) makes it worthless.