While playing through the game again, Jon really felt the rush of just slaughtering demons come back to him. It was doubly exciting to find out that Season 15 had just recently started and there was some really cool gear at the end of that grind. Playing through it again and nearing the end of the campaign got him thinking about the next step for Diablo as a franchise. He definitely thinks theres still plenty of room to grow and expand the game.
Source: N4G PC Its Time For Diablo 4