I'm getting quite sick of the power that is given to the miners in these cases... Shouldn't we be one big family? They should not be the only ones to make deciscions, because it will always be in their interest...
If miners simply did what was in their own best interests, they would opt for bitcoin-XT. They would make more money using XT than they do using core due to XT having higher transaction fees. The fact that miners disavow XT despite the fact that their profits will shrink via them doing so, illustrates the fact that XT has major problems and issues that overshadow any potential gains.
So no. Miners don't simply think about themselves when making these decisions. If they did they would opt for XT and the larger transaction profits they would gain using it.