I think both statements can be right. One game can drive sales in the short term. But one game can't rehabilitate the ailing fortunes of a console in the long term. But several highly sought-after games released at strategic intervals can lift console sales and support long term sustained high sales. But there aren't that many franchises that can support the many games at strategic intervals method. Basically gamers just have to love the console itself, and not enough gamers are loving Wii U.
“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
