I don't see this happening.
Valve is kind of a conservative business type and it's philosophy is "let the community handle most of things".
But when it come to sell games, valve hold a tight control. The demand for the ability to trade games on Steam is being requested by the community for a long long long time, and it's not in valve interest to allow people to "sell" unused games. It would hurt their business.
Also, they dropped support on BTC exaclty because of the price volatility associated with cryptos. So, business wise, it's not very good for valve to sell games for a currency that is too volatile.
And Valve is too big already to be able to implement such big change.
And i don't think STEEM and SMTs would be the best choice to something like this. The system is too complex, and when it comes to use coins as currencies, simplicity of use is the key.
But this idea could work as a brand new company, with a totally new business model. May not be profitable though...
Check this article from @techblogger. We will probably have something similar on the future, but probably not Steam.
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