There should be advantages to 1.4a even if you don't crave razor-sharp visuals. Since PC makers won't need as many data paths to drive lower resolutions, they can use thinner and more efficient displays. A laptop that "only" supports 4K could have longer battery life, for instance. The best part is that this is more than a theoretical exercise -- VESA expects systems to ship with the new DisplayPort by 2016. You might not see an 8K computer all that quickly given that this capability hasn't even reached shipping TVs, but the groundwork will at least be in place.