The word egosystem cropped up in today's Guardian. Resorting to Google as usual, I found out it's common enough to make an appearance in the online Urban Dictionary.
Even if this neologism is already a cliché, I foresee many other opportunities to use it. Here's the Lost in Showbiz context:
. . . we turn our thoughts to the fragile egosystem of musical theatre.
Perfect for a discussion of Elaine Paige and Susan Boyle. Or of various strutting US senators. Or of bankers justifying their bonuses at Davos. The list could go on and on.