Conina on 30 January 2014
Generation 9 is already won for Nintendo, if they start it soon... because Microsoft and Sony would skip it.
Wii U2 = 2015-2020, PS4 = 2013-2020, XBO = 2013-2020
After that they could start the 10th generation in 2020 or 2021 together with PS5, Xbox Two and Wii U3 ;)