I think GoT won't be the hit we excpected when it was revealed at E3 2018. I guess it has a shot outselling Sekiro (which sits at ~4m combined) but I'm sure that PM is going to reach 5m at least.
It would be a whole other story if we knew that GoT would be re-released on PS5. Though I'd still give PM a slight edge.
village boy learns to jump.