Well, they could but the entire community can just fork. Miners are under no obligation to stick with a crazy change like that. The core developers would only s

Well, they could but the entire community can just fork. Miners are under no obligation to stick with a crazy change like that. The core developers would only shoot themselves in the foot and make themselves never to be trusted again. And with Bitcoin Cash gaining in popularity, a fork is not an impossibility. In fact, BCH is popular because it's actually usable unlike BTC at the moment (extremely high fees, slow confirmation times).