Technically speaking, Georgia didn't comply, in a sense that it admitted the decision to be valid. The people affected were pardoned, which is basically saying "you're still guilty, but we'll let you go just because". They did not repeal the law in question.
In any case, the president can push as far as they think they can get away with. In case of Trump, based on his track record and temperament, he might decide to push all the way into a genuine constitutional crisis. And what then? What happens if an executive issues an unconstitutional order, SCOTUS declares it such, but top of executive demands that it be carried out people under him anyway? In theory, that's when Congress is supposed to impeach; but will a Republican Congress actually do so? And even if it does, what if the president refuses to vacate? Push far enough, and this is something that could only be resolved by use of force. If both sides use it, we're talking about a coup, and potentially a civil war.