Term limits have more downside than upsides. The problem they claim to address could be more creatively addressed by every state that can doing what Maine is doing this election. Mainers will vote on an initiative to replace plurality elections, which guarantee two party domination, with majority vote/ranked choice elections. By empowering third parties and guaranteeing they will never be spoilers voters do not have to choose between two extremes, and so incumbents will have to face a far more discriminating electorate.
On what is happening in Maine see rcvmaine.com