Im fine with old games coming to Xb1 and Ps4.
The original resident evil was a brilliant idea.
So was Halo ce, and possibly Halo 2.
But we don't need Halo 3, 4, Reach, Odst and maybe even Wars on Xb1.
Those games you can still play on 360 anyway, sure the servers will be shut down but who cares by then H5g and maybe even Halo 6 will be out.
Who is really going to go back to Halo 4 when they can play H5? not me.
^
Also Twin makes some good points