Even before the Surgeon General's Report that made smoking controversial everywhere, pipe smoking was more of a niche activity compared to cigarettes and cigars. You saw pipe smokers on the commuter trains and in faculty lounges, but it was never an everyman activity.
When I was in the Navy, 1968 to 1972, I can't remember ever seeing a pipe smoker in the ranks, shipboard or land station, officer or enlisted, zero, nada. Cigarettes were everywhere, especially among us enlisted.
In the 1950's, factory pipes were the main event at all price levels. Over-the-counter blends were the sustaining product.
Today, the variety of blends and their availability and distribution is at an all-time high in terms of number of blends and distribution and availability because of online sales ... I surmise. No data research here.
Likewise, the number of artisans offering their handmade pipes is probably as high as it has ever been, also thanks to online sales.
So, where to? I think pipe smoking will remain a niche activity. I think the number of pipe smokers will continue to dwindle. Some precipitous fad or trend among some demographic could cause a resurgence, among young people in some fields or regions.