I think it's a bit too simple to blame DRM for the "death" of PC gaming. It had it's moment of glory in a window of opportunity where the hardware was good enough and widespread enough to support a number of titles released each year. Nothing lasts forever though and while PC hardware is still superior (on paper), you have the problem of compatibility and a very large segment of pc owners who are neither tech savvy nor keep up with the technological arms race. Enter stage left, the closed platform, which takes the headache of updates and maintenance away from tech illiterates. That then leads to games aimed at the new, larger market with all its implications. Hardware that is inferior to a geeks highend Ferrari PC, but probably better and way more stable than the bulk of the Trabants running in large parts of the market. Games that are tailored to this new hardware, with controllers, limited memory etc. which for a some may seem inferior but for most people seems adequate.
"The birth cry of The Console Gamer created the immense Warp rift called the Eye of Terror and slew most of the PC Gamers and their favourite Developers in the Immaterium"