Yes Nick, I doubt we ever get away from E-bay entirely, but it does open the door more to Craigslist & the like.
I still wonder how some of these older collectors amassed some of the most impressive collections pre-internet

I think there are a lot of people monitoring facebook marketplace as anything that isn't way over-priced is gone within the hour. How long before those transactions or the messages between buyer/seller are monitored and charged some kind of fee? I'm very surprised Craigslist is still free to post ads on.