Yes. People have experience in 3e that suggests otherwise. Any vaguely competently made 3e Cleric or Wizard (or Druid, or Sorcerer etc...) would outclass a Fighter. But that wasn't the case in 1e/2e. Why do you insist on assuming that if DnD Next's Fighter is non-Vancian, then we must have a return to 3e's (as opposed to 1e's) power structure? Even if you simply refuse to consider that 3e's power structure may not accurately represent that of the previous editions, why do you still simply refuse to consider that the power structure could be changed? It certainly is possible. After all, we could simply remove all combat spells from the spell lists. I wouldn't suggest such an extreme measure, but it shows that something is possible.
Actually it was the case in 1e. The 1e fighter
sucked. I won't say it was the clarinetist of 1e classes - simultaneously sucking and blowing - as that distinction belonged to the 1e Monk. But the Pre-weapon specialisation fighter was little better than the cleric at what the fighter was supposed to be good at.
This is why Gygax introduced Weapon Specialisation, Cavaliers, and Barbarians in Unearthed Arcana. Turning the fighter into something powerful in mid-1e.
Yeah, the playtest fighter is outshone pretty hard, I'll grant you that.
And that's the fundamental problem. If we started off with a 2e fighter, who hit half as often again as someone else, there'd still be complaints about being boring. But that would be stylistic.
Actually, fighter vs wizard is a distraction most of the time. There are two sets of comparisons that matter and that seem to always be missed from these debates. If the wizard doesn't need the fighter you didn't just drive past the stop signal - but you've just gone through the wall, driven over one cow, and finally come to a stop by driving into a charging bull.
The magic vs mundane class comparisoms that are obvious are:
1: Fighter vs
Cleric.
2: Wizard vs
Rogue.
The fighter vs cleric is the battle of the heavy armoured melee types. If the fighter doesn't leave the cleric in the dust, he might as well sit down and slit his wrists. Clerics will always bring more hit points to the party if they have any sort of cure spells. And more flexibly. Clerics are simply tougher. And bring a lot of utility through magic. So if the cleric can fight almost like the fighter (Spiritual Hammer, I'm looking at you!) the fighter is redundant.
Wizard vs Rogue. The tricksy classes. The wizard will always be able to do things the rogue can't. Keeping the rogue in the hunt with that handicap is the problem.