Which is absolutely terrible. I don't want to buy it digitally and not even be able to play it once Xbox Live shuts down.
I don't think XBox live will shut down anytime soon. I'm not exactly sure what your concern is. I agree I would rather have a hard copy myself but worrying about not being able to play it because XBox Live will be shut down is not a concern.
When the 360 was released the marketplace for the original one shut down soon after. It will probably remain the same with the new xbox. Rendering all non disc dlc. Useless. And it is something we payed for but Microsoft owns it. We are just leasing it.
But you can buy originial XBox games for the 360 right now. Not all of them, but some I thought. The jump from the originial XBox to the 360 was a HUGE jump. I don't see that happening with the new XBox.
I'm sure when the new XBox comes out you will still be able to use the 360 with Live, especially since there are many more 360's than there were original XBoxes.