It’s a non-zero cost to develop the game. I sympathize with your desire to build an mmorpg that will pass the test of time without relying on servers, but you will definitely need a lot of money to make this come true. Crypto or otherwise.

Block times are complete state updates. The transactions that rely on the state of another transaction in the chain are 100% optimistic, and will roll back all dependent transactions. Now, that’s fine if you’re willing to roll back say…3000ms of your game state. But that’s all client side stuff, and that code is 1000% exposed, and you can’t upgrade it in the normal fashion. You also need validators for chain transactions, and your game can just be forked at any time by validators, splitting the player base. Kind of cool, but kind of defeats the balance and minimum population required to keep a game running. Also…the validators still need to run. Recovering a forked chain can only happen is someone has the state somewhere and is willing to seed new validators.

Sometimes, things need to end for another thing to begin. Sometimes it’s just best to move on.