Seems fine to me. Most likely Spell Focus will be the feat of choice for necromancers, enchanters, and illusionists, while Spell Tenacity would be better suited to conjurers, abjurers, and transmuters, while evokers might do well to pick up both (and diviners probably neither of them).
There would probably be a slight power slide up for casters, but IMO that's better than needing a useless Spell Focus (Abjuration) to get into a good PrC, for example.