I could see another charismatic actor [2] winning a presidential race but it will have to be one that meets the above criteria. It happened recently in Ukraine. It's happened in the US Ronald Reagan. The best candidates I have seen were all comedians but unfortunately they are smart enough to not want the job.
Perhaps Arnold could be appointed as Secretary of Defense. [3]
[1] - https://www.whitehouse.gov/about-the-white-house/our-governm...
[2] - https://en.wikipedia.org/wiki/List_of_actor-politicians
[3] - https://en.wikipedia.org/wiki/United_States_Secretary_of_Def...