FDR in some ways made the party of today inevitable. He got America used to Uncle Sam's insulation from the vagaries of nature. He tolerated communists in his entourage. He negotiated with Stalin over central Europe, Korea, Vietnam, and eurasia. Most of all, he taught them that the government was their best friend.
The New Deal was probably required given the Depression. But it could have had an expiration tag attached to it.
He had his faults to be sure. But he did not go further than Americans were prepared to accept. His heirs show no such recognition of the limits of ambition never mind power.