In a recent thread (http://gamrconnect.vgchartz.com/thread.php?id=178124&page=1#) quite a bit of people seem to be expecting this generation to out perform last generation. I'm here to say that this is not only wrong, but not possible.
Last generation the three home consoles sold ~262 Million consoles cumulatively, according to VGC. PS3/360 sold ~80 Million and the Wii sold ~100 Million. This generation, the Wii U is destined to sell less than 25 Million, the XBO looks to sell no more than 80 Million, and the PS4 at most to sell as well as the PS2*. When adding these up, you get ~255 Million. However, that's the utmost max for PS4 and Wii U.
Look at the numbers, look at the trends. Last generation was an outlier. This generation looks to be more like Generation 6 than 7. The gaming industry isn't going up, but down in comparison.
*Unrealistic.