I really like the idea, but I do think it would be more difficult than you make it out to be. I'm really doubting that it would be easy to actually secure such a partnership between Valve and Steemit.
If you look at the bigger picture, why would a big company like Valve create a partnership with the much smaller Steemit? I agree that the idea itself is good, but it would be very risky for Valve to attach their name to something that's so experimental.