Steam is a great delivery platform which handles
most but not all DRM issues. I've bought several Steam distributed titles that were very strict about re-installs, something only apparent after I'd bought them. Thanks Ubisoft!
Even as painless as Steam is, there's still the driver wrestling, yak-shaving that is maintaining a properly working Gaming PC. Some people enjoy the challenge. This is not going to fly with those used to the "put in disc, play game" crowd.
In time the "PC" will slowly fade away to be replaced by other things just as the precursor to the PC, like the "Minicomputer" and the "Mainframe", will become an anachronism. I'm not saying this will happen tomorrow, but you'll see a shift over the next ten years.
There comes a point where the performance advantage offered by the PC, which is considerable, is negated by the fact that developers can't make use of it. What good would a graphics card with 3,000,000 shaders be today? Why should you need a 256-core CPU to play games? If your equivalent console had only 1,000,000 shaders and 64-cores, which would surely attract scorn and derision, would you really be missing out on much in the scheme of things?