The way Tera dished out quest gear was pretty good (though not without its shortcomings), I almost always found myself in a matching pair of clothes based on the area/quests I was doing. I think it is fairly simple to have quests/regions assigned to certain colors for gear rewards/drops, and if not, a dye system that isn't too expensive should solve any problems.
They will do this. Skyrim was the testing ground for several ESO features just as oblivion was the texting ground for skyrim features.
Don't MMOs generally have all sorts of ring, neck, and earring slots though? I can't see TESO reducing the amount of gear. Of all the things they could add from Morrowind into TESO (that wouldn't already be in other TES games), their gear system by far would be the one thing I'd want to incorporate in TESO.
Bethesda and TESO are two different companies (sister companies), why would they need to follow bethesda on that, and why would bethesda create Skyrim to be a mediator for a game they aren't creating themselves?