Do you believe he will ignore his term limit? Who enforces that?
The alternative is violence. Is it not worth the attempt to avoid that?
The feds violate the laws and Constitution every day, just because they have not yet got around to violating a law doesn't mean they won't when they decide to. And the mere fact that one law is followed while many more are not, is totally irrelevant to the question of how to make the Feds stay within the constitution.
What's to be done about an out of control, overreaching, illegal acting government? Figure that out, and you might be able to enforce any new rules that are needed, or you may find that the new rules aren't even necessary.
Rememeber Al Capone? Do you think passing a bunch of laws would have made him any less violent or willing to obey laws? Well we are dealing with a bunch of people in the Government that are just as entrenched in their illegalities as was he and his ilk.
Still he was taken down, had his day in court, and died in prison. There should be a way to accomplish it without violence, we just haven't figured it out yet.
So when you figure out how to make sure laws are obeyed, let me know, till then it's useless to be adding in yet more laws to be ignored and broken.