>IMHO, the simplest solution is single-term limits. Obviously, there are upside and downside trade-offs to such a policy. However, I think the upsides might be worth the downsides, especially since the system is so clearly being gamed by well-funded adversaries to the public interest.

The people in power are the ones to vote on enabling that, but they will never vote against their own power. We already have the power to do this collectively and that is to vote out the incumbent every election as a default.