I suspect that support peaked sometime in 1994 when the public became very impatient with what it saw under the Capitol dome. Support, and certainly intensity, may be on the wane now, but the issue is still lively. Term limits still polls well, and old friends, like myself, remain steadfast in their support of the concept. First, we ought to define the concept. Purists like short term limits, but versions under twelve years are asking for trouble.
Short terms look extreme, probably because they are extreme.
But my old eighteen year model won't work, either. It fails the excitement test. Twelve years is a nice round number, and, for those who want action rather than an issue, the one most likely to succeed. Other conditions should not be unnecessarily restrictive. Persons should be able to move to the other body when their time is up in one chamber, and should be able to run for the same chamber again after broken service.