ATX can die as mATX fills the needs for 99% of people. It just doesn't cost less and there aren't nearly as many cases that are diminutive.
I went mATX this time, but hell, aside from servers and specialized workstations, even Mini-ITX works for nearly everyone. You've got a single x16 slot for a GPU, and for everything else, it's a rare situation where you can't (and probably more easily) find a USB3.x solution.
On that note, 5 years ago I would've expected to see Thunderbolt ports included by default on motherboards today. You've got $700 boards with all kinds of crap and fluff, and no Thunderbolt ports