Well, not quite -there are democracies where there is no impeachment in the law.
But in the US, impeachment is truly required for the balance of power, since the president can have so much. And that will hurt.

On a side note, France may become interesting in the near future. There is no impeachment procedure, AND parliement is now elected at the same time and for the same length of time as the president. We don't yet have the same organisation to ensure that the rightist party member always sing in tune as with the Republicans, but we're getting closer. And we are starting to get some electronic voting machines in Sarkozy's fief of Hauts de Seine.

I'm not overly optimistic.

Earth provides enough to satisfy every man's need, but not every man's greed. Gandhi