See
here. It's getting quite tiring repeating myself.
Nobody's changing any rules. 26 (or maybe it will be 25) sovereign states are perfectly entitled to agree any treaty between themselves. The rules for enhanced cooperation allow them to leave Ireland behind.
The amount of misguided idealistic navel-gazing about democracy that goes on among some on the No side is truly staggering. The EU is an oasis of democracy and stability in a dangerous and uncertain world. No, they don't have referenda in every state on every bloody treaty. No it's not perfectly democratic. So what? The sort of perfect democracy that some have in mind would be a recipe for deadlock and stagnation, endless negotiations leading nowhere. A form of democracy that would soon become discredited because it couldn't deliver solutions and address the problems of the day. That's just the kind of weak and ineffective democracy the political extremes of the left and right would love. Democracy failed in Russia and we got Putin (it could actually have been worse), democracy failed in Europe between the World Wars and we got Fascism. Don't think what has happened before couldn't happen again.