But the wizard could already become a melee machine with spells alone, and do pretty much anything. Warblade/duskblade just makes it slightly easier. MoMF? Shapechance/polymorph had already broken the game before that.
But the sorceror already could fly and be invisible and buff himself most of the day if he wanted to! He doesn't even need cheese to pull it off, I've seen it happen.
But I say it's better than comparing a fighter to a sorceror. At least now the sorceror can't just fly and laugh at the fighter when there's a wall on the way.