Can we have Physical to Digital Next Generation?

[aLkaLiNE]

ArchangelMadzz said:

So my solution for the next generation of consoles is that when a physical copy is bought you have the option after installing the game on the hard drive to run the game off of that hard drive and tie it to your account, but in order to do this the physical copy of the disk needs to be in the console and the console will make the disc unreadable to any other console but that unique console (for obvious reasons)

maybe it's because I've been up 24 hours now because of work, but this part doesn't really make sense to me. What's the point of digital if you have to have a disc in the drive to run it?