If Wukong gets a new passive, it ought to be a mobility one.
Something like Jinx's passive.
I think that his ult damage should be front loaded and make him more a teamfight assassin. We don't have many of those anymore. Many of the good ones (Kat used to be one, but her rework makes her less effective now. Same with Talon) have gotten reworked away.
One of the best parts of Wukong is that he's simple to play. Don't change that about him, esp when every other simple champ is getting reworked into complex ones.
This passive is also fine
https://www.reddit.com/r/leagueoflegends/comments/8nugmg/wukong_rework_thoughts/
except it should be done at random instead of activated