Being able to play the last generation of games on a brand new console may seem like a bit of a gimmick at first, but it is an incredibly useful feature that could help many gamers that are on a budget.
Being able to trade in your Xbox 360 console to help cut down on the costs of the Xbox One is a great option to have, but after building up years worth of games, it may not be that easy for many gamers to give that all up. This is why Xbox 360 emulation on an Xbox One would be immensely handy. In fact, while they're at it, if Microsoft could make the Xbox One support original Xbox games as well, that'd be incredibly useful.
Whilst Microsoft never revealed any plans to have such a feature on the Xbox One, recently Frank Savage, partner development lead at Xbox, revealed that it's not entirely out of the question. When asked whether there were plans to bring an Xbox 360 emulation system to the Xbox One, Frank replied with "There are, but we're not done thinking them through yet, unfortunately. It turns out to be hard to emulate the PowerPC stuff on the X86 stuff. So there's nothing to announce, but I would love to see it myself."
I'm sure if Sony were to offer an Emulation system on the PS4, Microsoft would feel obliged to follow through with a similar system, and vice versa. But until one player moves, no one is going anywhere with the whole emulation thing. Let's hope that Microsoft try to put more work into it, because I'd love to see it happen.