personally I'd think a way to make hybrids more valid is to look at the trance system and do something besides 1/2 ability modifier to insightful deadly.It's an easy fix, but I don't think it's the best thing for the game. We don't need to lose build diversity, diversity is the strong point of this game. Or at least it was. Everything is becoming more homogeneous.
For characters like the wizard I would much prefer to see an enhancement that allows the highest elemental lore and spellpower for all elemental spells. That would allow the wizard to use his entire spellbook - as a wizard should. That's the nature of the class. Turning it into another specialist is betraying the nature of the class.
And what you say doesn't help hybrids. Hybrids don't have room for spellcasting stats and weapons in their gear. I'm afraid the real solution to this is to create archetype-specific gear, instead of generic named items with random stats. And to solve the sentience problem.
If say, a gish like an EK or a DD had their own trance that gave insightful potency equal to their melee power (ranged power is far too problematic due to IAA) and insightful spell focus derived from something like constitution (and put out of the way of pure casters, actually this is impossible for sorc ek due to them not liking savant t5s)
Then you wouldn't have to gear for insightful spellpowers, wouldn't need to gear for insightful dcs.
There is absolutely room for trances to do more to support something besides making insightful accuracy/deadly/tactics entirely redundant itemization and considering the original implementation of trances was heavily skewed to helping Clerics melee better maybe it's about time to explore that space more in the other direction.