When you start a startup I hope you do it to not fail. Even if you might fail first time(s) the mentality that "as long as I don't get fired" I consider the same as "I'm not sure about this". I would say you must believe in what you do to make it succeed, make other believe in it too.
Was surprised to see that lots of high profile companies have in fact fired their founders. Steve Jobs was fired by Apple in 1985, Sandy Lerner was fired by Cisco in 1996, and Diane Greene was fired from VMware in 2008.
All power to the start-up entrepreneur but on the subject of that TW post - in the UK we have a word for them. It start with a W and rhymes with Bankers.
Changing a CEO doesn't mean you get fired. Sometimes it just makes sense to let somebody more experience drive the company. Good CEOs are very very expensive.