Modders will took his place. And then the fun begins. Nothing will be impossible, and content will get even more absurdal. I hope that Asuna will open a brothel in town FOG v2. And all the willing girls will work there... Tattoo saloon, plastic surgeon, FOG v2 with pregnancy, monster sex, dungeon with traps, cursed loot, barber club, dungeon randomizer so the level is not always the same... Gender swap allowable, all other girls menu stats with perks, usable Item menu and equipment menu, equipment swapable... More to RPG game content. Dialogue changes, maybe with dialogue options.
You know, everything is possible. Should i be worried?

Do i really will miss that much if dude decides to leave?