Road bars have not become wider in general, right? I see practically every bike with 40, 42, or 44, depending on size. 46s are still harder to find. So I don't see anything swinging back, since the only change was that 44 is a much more common size now. Now when it comes to mountain biking, wide bars are here to stay. I was on 680mm and always found those slightly narrow. So years ago, I moved to 710mm and am now on 740...huge difference in handling, and comfort on long rides. 760 would be my max (and have long arms...6'3 span) but 780 is common now. Stems have become much shorter. I think the big change is in mountain biking where you have to throw around the bike a lot.