I don't mind the change, or at least not much. The only long-term buff spell that has seen regular use in my campaigns so far is mage armor. I don't like stat-boosts anyway, since - imho - they only add numbers, not anything special. In one of my campaigns, players get to pick their stats as long as the PCs are balanced in the end (including items, classes, spells and special abilities), so I don't see a need for long-term stat boosts.
I am not even sure if mage armor having reduced to 1 min/level would be that bad, even though both my sorceress and my bard took that spell, and the extend spell feat almost exclusively for it.