Hey guys,
I would have to say the XBOX 360 will not go out of the charts for a while. It is mainly because people cannot afford the XBOX One, although there are some others who don't see the need and feeling of upgrading from the current generation of consoles, which was partially next generation compatible.
Microsoft will use the XBOX 360 as a sell point, for extra profit and sales. Most people won't buy their children a £500 console, especially as their first console. Doesn't seem to happen, they'll get an earlier console. E.g. XBOX 360, PS3 and Wii. PS3 will have a similar outlook, alongside the 360.