Why are they crapping their pants? Halo, Gears of War, Uncharted, MGS, God of War, etc.... will never on the supposed Valve box. There's more than enough console exclusives to support the genre. They're completely different markets anyway.
If the Console is crapping over the PC, is the PC crapping over the Tablet? There's enough user to support the three markets.
That is short-term thinking. The goal with Valve is obviously long-term. They are actively striving to make PCs as accessible and easy to use as a console. Once they achieve this, you have just given every bro who loves his Call of Madden 20XX easy access to literally decades of titles which will work on their "console" forever. No longer do you have to worry about your gaming collection becoming null and void on the new system just because "insert company here" is doing a cash grab by not making their next piece of hardware backwards compatible. Not to mention if developers notice a rise in PC sales more will have no hesitation at all to not only do solid ports, but exclusively develop for PC again with the MS/Sony/Nintendo as the systems to port to, whereas right now it is the other way around.
If Valve do this thing right then MS/Sony are going to have to definitely change their way of thinking. Definitely Sony. Sony has been dropping the ball left and right making stupid decisions about great hardware. I have watched Valve since they were still working on HL1, I fully expect them to do this thing right. They already have their own online "store" and are considered by most gamers to be PC Gaming already.
One thing I don't think people are considering when it comes to "BUT CONSOLE EXCLUSIVES" is the fact that yes, these will sell systems. No doubt. But...With PC gaming, and Steam, your purchase is with you, no matter what piece of hardware you are on. Even 10 years from now. Your gaming collection becomes a more usable collection, as opposed to something you put in storage when the new consoles come out and have to go digging around if you get a hankering to play that game from 2002 again. Also, I guarantee they will be actively making sure titles are up to date and compatible with people's current hardware and OSes, like GOG does.
And yes, everyone in gaming right now is noticing tablets/mobile. Especially Valve. They aren't stupid, they are going where there is potential for cash. Tablets and smart phones aren't replacing big screen gaming experiences for a good while. Not until the hardware/software in the things can support everything and being able to interface with all your devices, and play on your delicious 4K TV (or higher!) is the standard.
Sony took a bath on the Vita.
Fixed! Great hardware....ridiculously stupid decisions. Many facepalms to be had.