What would take the place of roblox

Fortnite and minecraft would both take roblox's place

Fortnite: battle royale game with building
Minecraft: massive 3d sandbox game
Roblox: game with millions of user-made games

I guess itch or steam if we want to get technical

"Yknow what else is massive..?

𝘐 𝘢𝘮 𝘢 𝘣𝘰𝘵, 𝘢𝘯𝘥 𝘵𝘩𝘪𝘴 𝘢𝘤𝘵𝘪𝘰𝘯 𝘸𝘢𝘴 𝘱𝘦𝘳𝘧𝘰𝘳𝘮𝘦𝘥 𝘢𝘶𝘵𝘰𝘮𝘢𝘵𝘪𝘤𝘢𝘭𝘭𝘺. 𝘍𝘰𝘳 𝘮𝘰𝘳𝘦 𝘪𝘯𝘧𝘰𝘳𝘮𝘢𝘵𝘪𝘰𝘯, 𝘱𝘭𝘦𝘢𝘴𝘦 𝘤𝘰𝘯𝘵𝘢𝘤𝘵 imgflip.com/user/32-Bit "

They would both get more gamemode settings to fill the gap
A third new competitor is unlikely

???