Term limits are a mixed blessing. Yes, we need to clear out some dead wood at times, but institutions like congress NEED competent, qualified members with some memory & experience of "how it all works".
I doubt that any of the proposed term limit ideas would achieve any real improvement in operational OR legislative procedure.

We have term limiting procedures NOW...it's called voting. What we need is a revised system about HOW one gets elected...including VERY comprehensive 'campaign finance reform' and complete overhaul of the primaries. Right now, honest, competent people with little money find it almost impossible to compete....and that new %$@%*$!! Supreme Court ruling about treating corporations as 'individuals' is already allowing anonymous money to be funneled to candidate who will be paid shills for corporate or international interests!

All 'term limits' would do is make it cheaper to buy new shills each time.