This was my opinion too but it seems Glastonbury have burnt through several options at this point to get to where they are now so Muse might be one of the last acts wiling and available to do it, especially with them not having any UK fests lined up that we know of.
Justin Timberlake, ASAP Rocky,
I do think that one will come from the list Tate McRae, Olivia Rodrigo or Sabrina Carpenter. One of them is likely to come and no matter people say, Tate is impossible, there is chance after some sentences (e.g. when I wrote on Insta that I want at least one more woman headliner, they replied that you're so greedy). But the other 2 are definitely more likely.
London Grammar, Machine Head are also likely.
The Weeknd, Lady Gaga are expected to go on a tour, but I think they will choose the Stadiums instead of open-air festival if they choose Europe.