I got it! Instead of making another All Star Battle Royale game, how about we get some sort of game where we jump from PlayStation franchise to franchise and interact with their main characters? So jump from God of War to Horizon to TLOU to Astro Bot and so on. Make it some grand, epic story, the sort of crap Sony is known for. They'd have to be careful to ensure each world and main character behaves properly, but if they're doing it with exclusives that shouldn't be too hard. Each franchise could be a grand adventure where you team up with that worlds hero as part of a bigger quest. You can even cross over the characters, I'd love to see Kratos take down a Thunderjaw from Horizon!
Anyone think it could work? :)