Honest question: How common is it for a company to flourish after the original sole founder leaves? Having seen founders forced out by the board first-hand mu

Honest question: How common is it for a company to flourish after the original sole founder leaves? Having seen founders forced out by the board first-hand multiple times, I've yet to see things really take off after the departure of such a key player. I'm curious if, on average, it's really the right move.