Neat idea, and I particularly like the streaming option, but... I won't feel good about something like this until Steam has a real competitor on the PC digital download front. With consoles, you know what you're getting into. MS is the only game in town on the XBOX, Sony for the PS, etc etc. With the PC, games come from everywhere physical copies, digital downloads from multiple sources, web games. It's an open system and no-one publisher/provider is running the show. Frankly, I worry about Steam changing this.
With physical media on a slow but steady decline and multiple major competitors floundering in light of Steam's success, are we far off from Steam being the only real show in town for digital downloads of major games? Everyone will probably say "well that's wonderful - I LOVE Steam!" now, when they have competition, but what happens if/when there are only a few token services fighting over 20% or less of digital downloads with almost all major releases coming on Steam? Then, what happens if you don't like Steam, or Steam changes policies, or Steam puts in a monthly subscription, or or or or... At that point, what happens to the "free" nature of PCs as we know them now if you're a gamer?
Frankly, I like MS, but I do not like that they are the only OS show in town for the desktop - I mean, what happens if they take this Metro philosophy (which I like as a hybrid) too far and really do away with the desktop and they are still the only OS show in town? I'm looking forward to future Android versions offering some (hopefully) genuine competition for primary computer OS's. What I would hope people who *hate* MS's OS monopoly are aware of is, we are in danger of other such situations arising in multiple facets of computing at the moment. Mobile OS's being locked into Android with no real competition, there being a clear controller of PC digital downloads.. These are not good things, even if they are services we liked. People LOVED Windows a ways back when it got us out of DOS - but when the bloom was off the rose, people realized "hey, I don't like this and this and this about it" and found they had no other option. Is this something we want in the future of game digital downloads?
On a side note, the most recent numbers I've seen were from 2011, and my whole above post may well be "the sky is falling" talk. Have the numbers swayed more heavily in favour of Steam domination, or less so? I know Amazon was a potential up and comer, and the Windows Store and Google Play potentially change the dynamic, but I'm still concerned. A veritable monopoly of digital downloads is NOT something any of us should want.