Weird how the things that make and RPG an RPG are the things that are most frustrating in an RPG, well, according to people that lament the loss of RPGs despite there being a fuckton of them on the market.
That's never going to happen at this point. They already dealt with the concerns that Mythic raiders had in Legion, and we were the only ones with a legitimate beef with the system. It's amazing for casuals so it's staying. Once they add something, removing it doesn't work. Look at LFR, they tried to make LFR even shittier in WoD by removing several things from it and look how that trainwreck worked out.
It would be the same with TF. Now that the casual masses that keep this game running have experienced TF they wouldn't respond well to it being gone.