The general consensus on this board 2 weeks ago was that both consoles will sell poorly. The general consensus today is that at least one console will sell poorly.
Publishers aren't as convinced as posters here, but I'm sure they have concerns. Makes sense to at least target the older consoles for a while. 10/15 seems extreme, but if the PS4 and 360 have only sold a few million each by then it makes sense. If they have two solid holidays then it's easy to just drop those products.