Yes I have been thinking of the exact same thing. Theres some people out there who believe we can already do this naturally without the help of the internet and computers to digitalize and link our minds. Check out the Beyond Dreaming section.

Anyway.. in the future im pretty sure it's going to be possible with the help of computers and internet.. some kind of dream controlled MMORPG.. would be quite awesome. Some people think this computer game you talk about already exists, and it's what we call reality. Cool avatar btw ^^