I don't think Hall will play that much more than he was already going to play, it will just be at 1B instead of DH. He still won't face LHP with so many other RHB options (regardless of how the pieces fit exactly).
A lot of us had ideas about how the Phillies could move on from Rhys early, and some people were even booing him in the World Series. So now we find out. It is very sad though, and I don't think he'll be that easy to replace so long as Harper is also out. And Castellanos wasn't exactly on fire at spring training either.
I doubt any team was going to sign Hoskins to a nice free agent contract to play 1B, he was already going to be a DH more often than not once he left Philly.