>>18065854Considering there's plenty of powerful pokemon that are even better with other items, you can always stay away from megas.
Consider a trick room team where you could run Choice Specs Chandelure, that's a gigantic 145 base special attack, with a 1.5 boost.
Same thing applies for the most useful items and their strategies. Life Orb, Assaul Vest, Focus Sash, Leftovers...
And once(if) we get the gems, it should shake things up as well, specially with Unburden users, Fake Out leads, widespread moves users. Plenty of things megas simply cannot do.