If it was worth their while, and that applied to the majority of miners, then they would probably get together and agree to start accepting bigger blocks anyway mining 50 BTC blocks, and wouldn't give a damn what core thought.
Thats the reality of it, and thats why I am not particularly worried any more about all hot air about why the block size limit subsidy should remain at 25BTC. The people who stand to make/lose the most will do what is needed. They have the power to, and the inclination.
Miners aren't stupid. If they see they can make more money mining 50 BTC blocks with loads of transaction fees. They will make it happen.
That's a rather interesting comment...
Are you sure you know how Bitcoin works?