Obvious answer is that it will totally eliminate the "screen" as we know it. Options to diplay the desktop wirelessly through a projection system and/or via an eyglass monitor display will change it all again. While they are at it, they may make it small enough to mount on your belt. Thus the iMac may morph to the MyMac. A wearable personal computer that will change it all yet once again.
I would buy mine today! Would you?
Where Does the iMac Go From Here?