The pipe smoking population has decreased a lot, maybe 80% or more, I'd guess. So the proportion of artisan pipes relative to the number of pipe smokers has increased a lot. Maybe half of pipe smokers own some kind of hand carved pipe among others. Also, I think the estate (used) pipe market has become much more established and accepted. A used pipe used to be headed for the trash, unless it was something special and unusual. The proportion of exclusively OTC smokers has probably declined, though they may still outnumber the rest of us. I surmise that there is only one volume briar pipe factory left in the U.S., Dr. Grabow in Sparta, N.C. Are there any others? This is a little off the subject of how the pipes have changed, but these are influences that may have changed the pipes. The dominance of filtered pipes, mostly 9 mm, in Europe is absolute, I hear.