To be fair, you don't really need the stuff from the last raid floor to beat the last raid floor either, so that's not really a good argument. Part of the fun in playing MMOs is feeling stronger with equipment upgrades. Take that away and people will just move on to the next big thing on the market.

However, if they wanted to start adding horizontal progression and/or gear with more interesting stats and bonuses, I'd be fine with that. It's probably never going to happen, though.