Chris Hemsworth has confirmed that Thor 4 will not be the end for him as Thor when he was asked about retirement:
“Are you crazy ?! I'm not going into any retirement period (laughs). Thor is way too young for that. He is only 1500 years old! It is definitely not a film that I say goodbye to this brand. At least I hope so.”
So at least Jane is not replacing him (yet) and we’ll get more Thor in the future. I don’t know how good it will all be, but I’m willing to give it a chance.
With any luck this a one and done for the Aaron trash in the MCU.