For me, WoW currently feels like a turn based game, completely predictable and not fun rotations of 1, 2, 3, 4...etc. The reason why I stayed subbed throughout legion was three things: mage tower, epic weapons/skins, class gameplay being fast/exciting/fun.
As things currently are, no amount of nostalgia or time invested in the game will make me resub or buy any more expansions. However, if the GCD changes are reverted and MACRO'ING is changed instead, I would resub in a heartbeat.
If the problem is truly macroing multiple abilities into one burst button, then simply change THAT instead of changing one of the most important parts of the game and what makes or breaks it for many players.