If we had affordable solutions for 4k 144hz nobody would be in business.
There are no solutions at any price for 4k at 144 hz. Two 980 Ti's struggle to get to 60 in most of the games in TPUs test suite. Until Display Port 1.3 drops, ULMB grows into that realm, and we slough through two generations of GFX cards, it just ain't happening.
USB C / Thunderbolt 3.0 certainly allots for it.
It's just a matter of performance, and some day that performance will be trumped, and so on. Eventually these companies are going to realize that after a while consumers won't have anything worth dumping their money into.
Also, I'm sure a few Tesla K80's could do it, why couldn't they?