The console and PC market may change, but the console market a bit more, mainly due to both using x86 architecture now, people won't have to run around screaming console port. With both consoles being nearly on par with a 'half-decent' PC, I think in the next 2-3 years we'll start seeing better looking games across the board (doesn't necessarily mean actual gameplay quality will improve though... lol).
Personally nothing on the PS4 is of any interest to me, and I think Sony was ungodly stupid to make GT6 for the PS3 and not a PS4 launch title. With there being no backwards comp, their big GT fans will probably ignore the PS4 at launch and stick with the 3 to play GT6. I'll be getting a new Xbox (Can't stand the name One... make me think of the first Xbox every time I hear it) most likely on day one to play Forza 5, and eventually Halo since I'm a fan (story, not multiplayer, don't give 2 craps about mp.) ANd am very intrigued by the other aspects of it.
With both systems not allowing backward comp, and not allowing used games, I see game stores drying up quick. (Goodbye Lamestop). Majority revenue for game stores comes from used games as they make all the profit, and their stock of old systems and games won't last long, Gamestop I know has stopped taking Xbox Original and PS2 hardware and games. I assume with Xbox One requiring installs, they'll be using some sort of serial key for games like PC does, only way that makes sense to me.
Another thing I'm intrigued by, but also wary about, are the built in streaming/video uploading functions. I have a bad feeling that streaming will be limited to low bandwidth and low resolution, and the video uploading will turn out like the YT function in the latest 2 iterations of the DiRT series, allowing you to only take 30sec clips from replays. Fact of the matter is, most people streaming from consoles, or recording footage, already have the external hardware to do so, and that hardware is leagues better than anything built in, almost guaranteed. And when was the last time people used Ustream? Almost everyone uses Twitch now. Just taking a cursory glance at Ustream, there are some live game channels, most of which have 0 to 1 viewers, and the majority are in the SEA region. A cursory glance at Twitch reveals 36,000 people watching League of Legends alone. Another 13,000 on Starcraft 2. Did Sony choose Ustream on purpose? Could they not negotiate a deal with Twitch? Something tells me the Xbox's streaming will also NOT be done through Twitch, and if so, then what's really the point?
Back to the main topic at hand, I don't foresee the PC market really changing much, if at all, aside from getting better games due to multiplatform games being developed on x86 architecture. I don't think pricing will drastically change, nor do I think sale prices will go up either, sales on digital games are still a much higher profit for companies as it costs them practically nothing to distribute, so until consoles become digital distribution ONLY, digital games on PC will probably continue to have good sales.