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Below are my vision for what an MMORPG would look like if it were made to appeal just to me. I don't know if anyone else would like the game at all, but that's not the point.
Not only would you as a player be able to change things here and there, but the entire world would be constructable/destructable as in Minecraft.
Resources would be relatively difficult to come by (as compares, say, Minecraft), in order to create scarcity, so that no player could play a character as an island, and be grandly successful. A player might be able to play a character as a hermit and barely survive, but even that would be difficult, often necessitating interacting with other players at times to avoid going without some basic needs.
Characters would require basic needs to be met in order to survive and thrive. This begins with being able to breathe, needing food and water, and a variety of foods, lest the character get dysfunctions like scurvy. They would also need shelter from the elements, or face injury or death from exposure.