30$ Bloodborne complete will definitely sell a couple million in first month. The game did alright on PS4 considering install base and difficulty but yea its gonna be hard to compare with PC sales since they gave it away with PS+. Longterm all the FROM games settle in at 2-4 million on Steam. Dark Souls 3 will be hard to beat so I say Bloodborne won't sell more.
Also I wonder if Medievil will be another title Sony puts on PC. It didn't review well like Days gone and likely didn't sell well. It was another one of those titles I skipped on PS4. My memories of playing the OG game is mostly it being basic but fun adventure/action game. A cheap copy on PC would be nice