I'd 2 years after the launch, so that's 2015. If the games/sales are good, then I'd say a $50 price cut after two years. If sales are bad...then I'd say a $100 price cut after two years. OR If sales are bad, then a $50 price drop within a year.
Generation 8 Predictions so far.....(as of 9/2013)
Console that will sell most: Nintendo Wii U
Who will sell more consoles between Microsoft/SONY: SONY