Honestly... the only reason we "need" them is because publishers and developers think they need to. Most of them are obsessed with mentalities and common market trends that they themselves in part created.
I personally think that new consoles aren't a bad idea considering how long the current console generation has gone on for. I just wish that console developers would release good, functional consoles with a decent line up of games and bring in a ll the "innovation" later.
I, personally, have never gotten on well with motion gaming. There are games for the Wii that I would like to play, I just don't want to put up with potential shoe-horning of motion based controls.
I've always been of the mindset that; the less you have to think about HOW you're controlling the game, the more immersed that you can get into the games you're playing.
Companies want consoles so that they can continue to compete with each other and make better hardware, to get the better games, to get our money.
We don't need better hardware because entertainment is a trivial part of our lives. We don't need fucking Star Trek tech in our living room to enjoy video games. Also artists have proven time and time again that you can develop perfectly good games with the hardware that currently exists.
Also in terms of graphics we've pretty much peaked. Textures and graphic are at the point where they hurt the believability of the artificial worlds by making the incongruities more obvious.
well even if they do make more does anyone really care if there's another console? I really don't believe that there's going to be a PS4 for certain, but it'd be pretty persuaed if Sony's really going to bother