Dominion is fun, but the lack of balancing attention for it as well as no real professional following for it (i.e., no ranked, AFAIK
), people just don't play it. Honestly, this applies for any "new" map and game mode they try to make. Pretty sure Magma Chamber would be no different.
As for Twitch, Expunge better have some nerfs to balance out its buffs, because that skill is a **** right now and it looks like it's a bigger **** with these changes. （ ´_ゝ`）