Great way to logic. Let me try...
You cannot reform the United States of America because at it's core it is a capitalist and imperialist country that will always put corporate interests over human interests.
Oh shit, now the whole project is hopeless. Let me try again.
You cannot reform humanity because at it's core it is selfish and self-serving.
I guess we are all fucked. Or maybe we grow the fuck up and deal with the reality of what's in front of us and the work involved in making things better. If we can't reform the Democrats, then we have no chance in hell of shepherding a new party from nothing to national powerhouse without losing it to the same corrupting forces that hold the Democrats. Never-mind the realities of what it would take to take over the country with a third party in a first past the post system.