What we need in the era of more and better and newer external monitors coming out every week is this: A Thunderbolt hub which contains a GPU. Plug in a video source (any Mac computer) and the the video is processed and exported to a Thunderbolt out port and can be output to 4096x2160 @ 120Hz or 144Hz or higher. Maybe have 2 or more output ports. Does that make sense to anyone else? Seems like it would solve a lot of problems for older Mac users who want good, fast, awesome external video but don't want to buy a new computer to get it. Thoughts?