Edit:
I should probably expand on that. Yes, in some cases keeping the founder as a CEO can be important for the morale of the team, but sometimes bringing in outside experience (the so called 'adult supervision') can be very important for a company. Eric Schmidt did a great job doing this for Google, before he assumed the role as chairman, leaving the CEO post for the founders at a later point.
Edit: I should probably expand on that. Yes, in some cases keeping the founder as a CEO can be important for the morale of the team, but sometimes bringing in outside experience (the so called 'adult supervision') can be very important for a company. Eric Schmidt did a great job doing this for Google, before he assumed the role as chairman, leaving the CEO post for the founders at a later point.