One never knows how people will be once they are in office. Selenskij could have turned out to be a complete failure, just as Kamala Harris, who received tons of praise in advance, has turned out to be a failure. Ukrainians are lucky that Selenskij became such a good president.

you think a bunch of supporters could persuade him to run?

And would Stewart remain ….?

You have to be kidding, unless you are into banning opposition parties, media dissent, a refusal to talk with those you are in conflict with, wage war against your own people and attempt to ban a whole language over a third of your population have as a first language (including himself). Then there are the seizures of historic monasteries, and an unwillingness to abide by agreements which admittedly were forged in bad faith.
Do you know he was voted in overwhelmingly, like 80%, as he promised conciliation and peace with Russia then promptly increased shelling of the Russian speakers in his own country, ones who had voted for him?
"Honest, sincere...................give us a break"

We have to be careful as we've already had two inexperienced actors who made it big in politics, Reagan and Swarzenegger.