I have a 360 and Wii and I'm definitely not ready for the "next" next gen to happen yet. I haven't even bought a PS3 yet, although this will most likely happen after the next price drop. Like others have said, this gen has atleast another 2-4 years left in it. Natal and Sony's wand will keep them in the game a few more years and Nintendo will eventually upgrade their last gen graphics with an HD solution.
As for the upcoming 3D gaming that the PS3 will support, I'm sure that it's just another fad. I don't even like watching movies with 3D glasses on so I'm definitely not playing games with them on. Console graphics this gen(not including the Wii) already look good enough and I don't even think that the 360 has been maxed out yet. The PS3 obviously isn't maxed out yet and I can only imagine how good the next Uncharted will look.
As much as I like my favorite game series, theres no way in hell I'd buy a new system if it launched within the next two years. If they want to start talking about it in a year or so, thats perfectly fine. But right now all my gaming money is going towards this generation.