I don't think you'll ever see multiple Gain spells active since it'll likely mean WHMs can do Boosts, too. WHMs aren't exactly slouches one Enhancing magic these days, and I doubt SE would be keen on basically 20+ all stats for everyone outside of Abyssea.

As far as our damage split in the TP/WS department goes, I'd actually like to see our TP phase get the biggest attention. Part of it is a gear problem, yes, as us going balls out Haste usually means lacking ATK/ACC. Part of it is a mechanics problem, like T2 enspells or the poor aging of enspells in general. And if they tweaked Death Blossom's added effect to be worth a damn, it might be worth something as a utility WS while those more concerned with damage can go for CDC. Either way, better the TP phase gets, the less ground the "TP Feed" detractors have to stand on.