I only wish 4K was offered in 16:10, or just that 16:10 was more popular in general. I'll be hanging on to my 1920x1200 until it dies.
On the other hand, it's sufficiently big that I don't generally need such a large space. I could have gone with a physically smaller 4K display with a higher DPI and still been very happy.
Tilting them on their side doesn't help, because they're far too narrow that way.