Sigh...correlation does NOT equal causation folks. PC sales are NOT down because of tablets, its because PCs have become insanely overpowered and therefor you don't need to replace every couple of years like during the bubble that was the MHz war.
Take myself as an example, LOVE hardcore PC shooters, practically the games that built the PC gaming business. I used to build a new PC every 2 years like clockwork and gave it a major upgrade at the 1 year mark, now? My AMD Hexacore is pushing the 5 year mark with nothing more than a GPU upgrade. I mean why should i buy a new one, when the one I got plays every game I want to play at over 30 FPS without fail? Its got 8GB of RAM, 3TB of space, I might add a caching SSD for my BDay but other than that there really isn't much more I can do that will really affect gameplay.
And THAT is why PC sales are down, its because even the low end gamers have insane amounts of cycles to spare. Hell my youngest has an AMD triple we unlocked to a quad and an HD7750 and he plays every game he wants to play at over 30FPS and his system cost less than $400! Even the low end systems are just so insanely overpowered its not even funny and with the XBone and PS4 going with a netbook chip? Really doubt we are gonna be needing octocore PCs to game any time soon.
As for TFA...how about making games that don't suck? How about that? Make smaller games that target a market instead of some crazy costing AAA title that you have to make as generic as possible to have "broad appeal" which is pretty much a codeword for "boring generic crap". Look at Payday the Heist, they listened to those that bought the first one, gave them what they asked for, they made a profit before the game even came out just on preorders. Make something special? Folks WILL buy. Make generic "Call Of Honor: Halo of Killzone Edition" and watch the numbers suck. It really IS as simple as that.