I hope the leaderboards don't take to long to roll out. Keep the interim complaining to a minimum. 😉
I think gameplay will improve, but the game rewards will be lower for those stuck in the lower levels and that's what will be the bugbear for many. Having said that, potentially it could balance out if you're on a more level playing field, because you'll be able to get more wins, therefore more DEC earnings, if you're not constantly battling people with way stronger decks.