This is revolutionary because on any other platform, the developer produces the software and the distributor takes a cut of the earnings, and the console manufacturer takes a cut of the earnings. (Remember all that "loss leader" talk when new consoles come out and are cheaper than what it costs to manufacture them? This is why.) By the time everyone gets their slice, you have a pit of dedicated game developers making $15k a year that have put up with distributors telling them what kind of game to make, who then ultimately get fired when they've done their job as commanded. Seems like a career you'd need to love to stick with it.
Even if the numbers don't work out in the end - if OUYA's cut is just as big as the big guys, if the CPU doesn't cut the mustard, if developers can't sell big enough numbers to stay afloat, etc. - it still seems like a worthy enough idea to back it if you're a gamer and want to see what developers could do, free of the shackles of conventional distribution. I can also completely understand people being relentless about personally promoting the console if having more gamers is actually what it needs to get the game developers to break even developing for it.