If you're talking about destroy America as it was intented and transform it into what they would have it be (IOW USA in name only but without the principles that made us great), then it would be short lived. In order to have a country be functional, you have to have cooperation among the citizens, which they would not have. They have way too many people who are opposed to them and who will not participate. Apathy would set in. You can't function when half or more of a country doesn't care and won't cooperate.
That's one thing the primitives refuse to discuss, that is, the subject of apathy, specifically when related to the country should they ever get their way. After liberalism sacrificed the ability of people to pursue life, liberty, and the pursuit of happiness at the alter of redistribution, there would be too many people who just simply wouldn't care anymore, the country would be unable to support all these social programs they would want, and at that point those who can't deliver become useless. Apathy.
Tell a lib that if the country ever became what they would have it to be, when that country is attacked by a foreign gov't (which it eventually would be) that you'd not pick up a weapon to defend it. You see, people are willing to fight and die for freedom. Liberalism is not freedom. When you tell them that, they have no grasp of what you're really saying nor the consequences.
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