Think through the downstream impact of term limits... where does the power accumulated by long-term congressmen go? My guess... it flows to either/all of career bureaucrats, lobbyists, or career congressional aides. Do we really want to cede more power to groups that are not elected (bureaucrats, lobbyists) or elected-by-proxy (aides)?
Depends on what power we cede. We should give them clear rules so they can make decisions based on their expertise. They should not be making the rules though (except as suggestions to congress - as experts this is an important part of their job)
I take the exact opposite view. A revolving door of congresspeople would decrease the influence of lobbying (and, for that matter, the influence of political parties in general), because once a member of congress reaches their term limit they would no longer be influenced by campaign donations.
Also, let's take a step back:
> where does the power accumulated by long-term congressmen go
We need to take a very hard look at any supposedly democratic system in which power is "accumulated" by individuals. Deeply entrenched politicians who never face term limits nor reelection resistance have no reason whatsoever to care about the will of the people.