All the old consoles have really died this year:
X360 / PS3 in 2008: 21m
X360 / PS3 in 2009: 23m
X360 / PS3 in 2010: 27m
X360 / PS3 in 2011: 28m
X360 / PS3 in 2012: 23.5m (22.8m through Dec 22)
All three in 2008: 45m
All three in 2009: 54.3m
All three in 2010: 44.5m
All three in 2011: 39.6m
All three in 2012: About 29m
It's probably fair to expect PS3 / X360 to drop 20-30% in 2013, to 17.5m or so, with Wii only doing 2-3m for the whole year. Wii U should be 10-15m though (120k-180k * 43 weeks, plus nine big holiday weeks would be 10-15m)
People are difficult to govern because they have too much knowledge.
When there are more laws, there are more criminals.
- Lao Tzu