Last generation seen a total over over 160 million consoles sold across the 3 major consoles. That current figure for the ‘next-gen’ is currently sitting at just over 15 million. This means that less than 10% of gamers who owned a Wii, PS3 or Xbox 360 have one of the three new consoles. Of course, this doesn't mean doom and gloom for any of the consoles considering their short life span, but it does mean that pretty much all of the market is up for grabs and we shouldn’t be too concerned by how a console is performing just yet.
Update Should read 260 million, not 160 million.