Of course I want there to be someone smarter than me to take over, from an altruistic perspective. Or even from just a selfish perspective of being scared, wanting a vacation, and feeling a bit isolated.

And of course if that actually happened, it would be a severe blow to my ego.

And so long as I can do the expected-utility-maximizing thing and invest the appropriate amount of effort into preparing for the possibility without betting the whole farm on it, I have no intention of hacking at my emotions on either score.