As for Szydlo's dismissal, I think that JK is more probable than MM.
Yes, likewise. I cannot imagine Morawiecki wanting anything to do with some of the clowns in the Council of Ministers.
I don't think it's cool to get rid of her,
I think there may be some logic to it. She knows how to run a campaign, and as it stands, PiS have zero chance of winning in Warsaw. So, it does make sense for her to stand down and focus on winning in Warsaw - if PO and Nowoczesna tear each other apart there, then she might just be able to sneak a victory. Szydło is an excellent campaign manager as you said, and it's hard to imagine anyone else from PiS having a chance there.
Of course, the flip side is that if she does do that, there's a huge chance that the opposition parties will all stand aside in favour of a common candidate against her.