Looks like a typical intergenerational transition to me. While I agree console sales will decline (i.e. 7th gen was the peak gen for consoles), which means the peak year for gen 8 will be lower than the peak for gen 7, 2013 will probably be a proximate low point and sales will climb from 2014-2016 or 17 before they start going south again.
Wii U will get a price cut, which means it will increase in sales, and PS4bone will sell very well. I expect PS4 to peak in annual sales somewhere between 15 and 20 million, and Xb one should peak at something close to X360 but probably under, maybe 11 or 12 million. 3DS will probably peak at 20 million in a year, but it won't get near DS's 29 million peak. The less said about Vita the better. So I think the gen 8 peak will probably reach gen 7's 2010 level, but it won't get near gen 7's 2008 peak.
“The fundamental cause of the trouble is that in the modern world the stupid are cocksure while the intelligent are full of doubt.” - Bertrand Russell
"When the power of love overcomes the love of power, the world will know peace."
Jimi Hendrix
