Admitting there's a problem is the first step.
There are so many good ways to respond to an epic employee waxzing lyrical about amibtion that I don't even know where to begin.
How about asking you how much ambition it takes to churning out the same game an infinite amount of times?
Or I could point towards your solo project and smirk at it's ambition.
You maybe good enough to get a game done, but to quote someone you may know, people don't switch for good enough.