Eh, some 120 Hz monitors recently started using DL DVI again. And one DVI is not a problem. The problem is video cards not using this port layout, which is perfect and single slot:
http://multimonitorcomputer.com/ima...X-royalQueen-6-monitor-video-card-outputs.jpg
if that HDMI is 2.0 then there's nothing you can't run from this, 5K monitor, 4K HDTV, gaming monitor, anything and everything. (Remember, DisplayPort is DisplayPort++ really so this port setup allows for four 1080p HDMI/DVImonitors)
There were a few cards like this, a Powercolor HD 7950, the Club3D R9 280X on the photo at least. It's not new by any stretch.
Speaking of that 7950, remember the cheat of a cooling it had?
https://www.overclockers.ua/video/amd-radeon-hd7950-powercolor/all/ and that was a 200W card. Can't see why a 100W card couldn't be single slot... there are 23mm high LGA 115x coolers, 18mm thick active RAM coolers
http://www.frostytech.com/articleview.cfm?articleID=2377 something surely could be done.
As for the 1060 Ti, there's a 40% gap between the 1060 and the 1070, you can squeeze a chip in there.