I suspect they are waiting to see what Disney does with the CMs covered by unions first. Universal TMs, SeaWorld Ambassadors, and the majority of Disney CMs are all the same pool of people. Especially with the current labor shortages none of them can afford to lose workers with a vaccine mandate if the others don't also do the same. If people don't like the mandate or won't get vaccinated at one, they jump ship to one of the others. My hope is they all get together and require all their workers vaccinated. Of course if one of the parks doesn't require the vaccination they may have staffing issues with more workers getting sick as well.