What do you think is the cause of the shortage? The weather? Or do farmers not grow this crop as much anymore?
Well, they say
it's the weather and the other time there was a shortage we had a late summer/ early fall that was quite stormy. That said your suggestion that farmers are not going pumpkins as much could play a role as late summer/early fall is a time when storms are possible so one would think a percentage of the crop being wiped out would be planned for particularly since Halloween and Thanksgiving, the two holidays people associated with pumpkins, have become so big in the U.S.
I always look forward to stocking up on cans of Libby's canned Pumpkin when they go on sale. Maybe I'll contact them and ask as I think their customer service should know something about pumpkin growing, etc., and the last time they actually put out an email to those whom were on their email list.