Not too bad but I think it would hurt them both if they were to go over that. Most people game on consoles due to it's cheaper than PC to where your hardcore gamers are PC Gamers. Heck I do some gaming on my X-Box but most of it on my PC and $400 is just about what I pay for video cards. I do most of my gaming on the PC and very little on the X-Box or console just depends on what you can afford. So $400 might be a ok starting point but I think they will have to come down really fast to get the people to upgrade right away. That is if either consoles are this much again the so called experts or analyst for most part have no more of a clue than anyone else. Especially when many of them never deal with this things in the real world so most time it always just a guess when it comes to many of them.
http://www.neowin.net/news/analyst-next-xbox-and-ps4-consoles-could-be-priced-up-to-400
http://www.neowin.net/news/analyst-next-xbox-and-ps4-consoles-could-be-priced-up-to-400