i realy dont see a problem that dt's need cloth/light armor with magic/wisdom to increase dps, its quite adquate that you need to use dps gear for optimized dps results.
what makes no sense is changing it.
what class realy needs is a small revamp/tweaks to balance useless unused feats, and particularly adjust vom and class abilities/buffs so vom isnt only usefull perk.
right now if you remove vom dt wont be able to compete in any aspect of the game with any other classes.
vom is comparable to sw but with no negative buffs/dots/self damage
further then that there is no class in game who gets 125% crit damage buff from dealing damage alone and able to keep that buff up with no cooldowns.