It’s not crazy to talk about it:

The Framers intended impeachment as the ultimate accountability. Without at least the credible threat of it, there is no realistic checking of a president who seems increasingly disposed to abuse his awesome powers, in fulfillment of a promise to “fundamentally transform” the United States of America. Maybe we are already transformed. The Framers did not see impeachment as outlandish; it was a realistic response to an imperious executive’s seeking to upend our constitutional order — the specter of which gripped the constitutional convention with fear.

I think that we’d be a lot better off, historically, if more presidents had been impeached and removed (Wilson certainly comes to mind — Clinton should have as well). Such examples might rein in their dictatorial tendencies. Unfortunately, the Founders didn’t anticipate political parties or the degree to which party loyalty would overcome legislative-branch jealousy in their prerogatives.