Founding Fathers never envisioned citizen-servants in Congress as becoming career politicians (although quite a few did very quickly). Remember, they ALL actually went home when Congress wasn't in session. They all lived proximal to Philly (still took days of travel to/from) and their law practices, shops, farms, etc needed tending to.
Term limits weren't part of the early founding of America (neither was POTUS actually), although several Founding Fathers worried over a "President for Life" type as we transitioned from Articles of Confederation to what became the Constitution. Since George Washington served 2 terms, that became the convention or etiquette in the Executive--but for Congress it never stuck. Franklin D Roosevelt smashed it during his 4 terms (maybe/maybe not necessary because of WWII). There was enough worry that because of his terms, Washington's 2 terms was forever spoiled, so boom, 22A was passed (I think thats the right one I'm too lazy to look) and limits POTUS to two elected terms.
For those serving in Congress, term limits comes up frequently, and has for years, but no serious action ever gets taken.
And around and around we go as Rome once did.