Presidents not serving more than 2 terms was a convention first established by G.Washington, but as we know FDR broke the convention by being elected 4 times to serve as President. I wonder why would Americans seek to avoid that in the future when FDR is widely seen as one of the most loved and effective Presidents in the country's history.
A similar question was asked on this sub about a year ago, which I answered here. Hopefully, this addresses your question.