I disagree. Whatever ACF WotC ultimately chooses should be placed right alongside at-will cantrips in the Player's Handbook (assuming they use the three book model). I see no reason why the class write-up shouldn't say something like:
Wizard Ability
Pick one: At-will Cantrips or [Insert ACF]
Neither is default, both are available.
Now, there are some modules that cannot be placed in the PHB, and teh DMG or UA may be the correct place for them, but at-will cantrips is not it.
Sure, give them equal footing in the PHB then.