Yea sure, now ppl will run other specific pokemon in their team just to counter blastoise.
JOLLY 252 Atk Light Ball Pikachu Volt Tackle vs. 252 HP / 252+ Def Blastoise: 330-390 (91.1 - 107.7%) -- 43.8% chance to OHKO
I doubt ppl will run Bold with 252def just to hope not being OHKO volt tackle.
But then what, are we gonna see pikachu ban if she reach over 50% usage?
PS: I was waiting Toise ban, not ampharos :/