More likely you'll be the one leaving.

Perhaps. If there was an culturally Anglo mostly white alternative to living in the US I would certainly leave, but every "white" nation in the world has the same immigration and multicultural disease. The current paradigm is already quite good at getting rid of the "wrong" whites so there is no need for the establishment to force someone like me to leave - sky high suicide rates, drug abuse, impoverishment, awful fertility rates ensure the disappearance of a right wing bloc of whites as an impediment to the ruling classes power.

Dissidents have very little political power.

Sure. No one has any real power outside the liberal establishment. That's why pining for an ideological solution centered around individualism and "freedom" will fail. The original culture and ideology of the US centered around those things (to the extent they ever existed outside American self mythologization) is already dead and gone in the majority - modern liberal whites mostly don't care, blacks don't care, recent immigrants especially don't care. Their only interest in the US are it's material conditions and freedom to be as degenerate as possible. That's why someones life can be ruined and driven into poverty for saying the wrong thing online - because most people outside some core of whites and marginal fraction of minorities do not care about freedom of speech. We already live in a modern panopticon where peoples lives can be controlled, bathed in propaganda, and people turned against their own self interest. Your ideas about freedom and what the modern US is are just shadows on the cave wall at this point.