I don't think that the American judiciary's problem is that it's hindered in its actions.

Historically, we should have seen more impeachments of federal officials; Congress needs to wield its authority in an exercise of checks and balances on the executive and judicial branches.

The Ethics Committees largely hand-slap only the most gross violations of their members. I see your intent there, but I'd much rather see Congress holding a higher standard of itself.

If you're referring to the overreach of Federal officials, then that gets a bit more sticky. Yes, it should be reined in, but when I see one Congressmen one-upping another on how we need to be "tough" or have "no tolerance" for this or that, I'm little surprised that our police and intelligence agencies act the way they do.

Puritanism dies hard. I'd say the constitution is working perfectly: the government we have is the one we deserve and one that really does reflect what this country, on the whole, wants. People in this country are still overall prudes who want harsh punishments, and that's what we've got. We don't need to fix the constitution, because that won't fix the root cause which is that our society needs fixing.

Can you justify this in a non-self-referential way, ie: via data other than election outcomes?

I have a much greater likelihood of engaging my state and local politicians than I do my federal representatives, and while New Hampshire residents have more direct representation than, say, California residents, it's still dramatically improved over our representation by federal reps.

This of course comes with its own set of pitfalls, for which the federal government has been placed as arbiter, and ceding / being granted power with which to remedy, but in my opinion, term limits seem to be more of a band-aid for a hemorrhaging wound than a a root cause fix.