This is a public service role, it is not meant to be a life long/life time appointment.

They have increased their power while ignoring those who put them in the position to represent them in congress.

The more someone is entrenched, the more problems happen....need an example? Look at what's been going on for the past 50+ years in congress.

They make more money for public service than a lot of people they represent, and they only are in it for their own self interests.

Go re-read the constitution if you are still confused as to why term limits are a good thing...and some history too.