Companies and money control the bureaucracies. You seem to think government controls corporate America, when it's the exact opposite. If left unchecked in the forever inexperienced Houses, lobbyists will simply tell the bureaucracy what to do directly.
Let me put it another way-- the problem with government right now isn't how long people serve, it's the type of people who serve and who they must answer to win the office in the first. Imposing term limits won't change the character of the people who get elected, because candidates will still have to agree to be controlled by special interests in order to have to money necessary to get elected. Nothing changes but the faces, expect that the special interests get more confident because no one stay around long enough to really threaten their control or gain personal clout. Nothing changes but the experience level of our legislators.
But if you change how the actual elections process works -- make it possible for a candidate to get elected without being forced to take mountains of special interest money (and the strings attached), or to defeat someone who does have that influence backing them -- then you've accomplished something real. You'll get better legislators, because they can run without selling out. And then you won't be so keen on moving them out after they gain experience.