I don't think the loot lock out is necessary. There will still be people farming CT for a couple of reasons:
1. Vanity. (remember Vanity Slot system will be out as well so this will be a very strong reason by then)
2. Help gear up character for turn 1-5, save you some time to farm tomes to exchange for DL.
3. Not everyone can farm turn 1-5 with DL gears, even if they're nerfed. Just look at those ppl who can't even do CT very well.
