I fully agree with the notion that some of the men highlighted in the attraction are... well, not the best people to be celebrating, to put it nicely, given they even had a lot of contemporary critics of their horrific actions. I've never liked Jackson in particular.
But you want a cynical, business minded reason to replace?
Here's one. Disney World relies so, so heavily on not just out-of-state visitors, but tourists from out-of-country too, Canada and Quebec in particular right up there. They're already going to be feeling the hurt from Canadians deciding to boycott America as a whole. They open HoP back up with a certain person who wants to threaten Canada's sovereignty given a speaking role, well, the few Canadians who still want to visit America might just decide to go to the nice resort up the street with a brand new park with Mario and vampires and dragons. And I imagine Canadians aren't the only international guests reconsidering an America visit right now, and would be flabbergasted by Disney boasting about HoP reopening with the current president speaking.