The worst oversight of the founding fathers was not creating term-limits from the beginning. Congress was supposed to be 'public service'. They were suppose to make a subsistence salary. It was never intended to be a lifelong career, turning Congress into a body of millionaires, 10 or 100 times over.
The reason the founding fathers didn't bother with term-limits is because it never occurred to them that people would want to stay. They left their homes, and farms, and family, to do it as a civic duty. They couldn't wait to get back home.
But then, Congress discovered that they could vote in their own salaries, benefits, vacations, and their own rules that govern them. And now we have the utterly corrupt mess we have today. Almost all of Congress is in the upper 1% of wealthy Americans, they have benefits and vacations that no normal American could ever dream of, and they do not have to live by the laws they create for the peasant class.
Essentially, over time they have voted themselves a little privileged utopia on Capitol Hill. And nobody is allowed inside their dream world, nobody can enter their fantasy bubble world unless they approve it. Or so they thought until Trump happened. Now they are all frantically trying to restore their very exclusive dominance, like the so called cool-kids in high school. And they seem to be winning.