I mean, the fact there even needs to be reporting about whether he'll be sacked over the result of a single game indicates pretty clearly he is, in fact, close to getting the boot. Howe, Frank, Glasner, and Iraola aren't having any reporting about potential sackings if they lose their next game.
I would put a lot of money on 1/1 odds of an Amorim sacking by June 1st, personally, and I don't really ever bet on sports. That's 8 days after the final Prem game of the season, so even allows for the scenario where he makes it the rest of the season and only gets fired afterwards. You're right that no one knows the true odds, but I'd bet something like 80% or even more. We've been really bad for an entire year under him.
All of which is to say, I think it's very realistic to think about the potential summer moves with an eye that we'll have a different coach. To me, the surprise would be if we didn't.