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there's the possibility of GPUs in the display, though

That makes a lot of sense, but I haven't seen any hints that it's coming soon. Keep in mind, you really need an upgradable GPU for that, since these $1000 5K displays have a long life cycle.

And it would probably require rewrites of high-performance apps and games to be something closer to client/server setups to manage communication between the CPU/memory and GPU.

There is really no difference for anything but the most demanding applications though.

5K displays won't cost $1000 for much longer. Right now they are premium products but soon they'll be the norm. By then, adding a good enough GPU to the screen will make sense (because your laptop doesn't need to carry - and feed - more brains than needed to push pixels to the built-in display) and, if the user wants more, they'll use whatever is installed in their computers.

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