Do you remember flat bars? They’re almost completely dead, but not quite there yet. The tide has shifted, and people have realized how stupid they look and how bad they are for riding. Flat bars, please finish dying. Now.
On the other hand, I was at River City Bikes the other day, and they probably had 25 high-end MTB handlebars in stock, and none of them were over 10mm rise. So maybe we’re not out of the woods, yet.