From my perspective the hobby is fine. It is just evolving as it always has and always will.
Facebook is a great platform for hobby community and its ease of use is unparalleled especially compared to the ancient version of vBulletin this site is based on. For the record, if we upgrade this site, we would likely lose our archive of threads and the hassle just isn't worth it at this point.
Yesterday I posted about 60 cards for sale in several facebook groups, and had 6 deals done within an hour. And I promise you I won't be scamming anyone or get scammed myself. Why didn't I list them on here, same reason everyone has stated above, too much work, too small of a buying group.
I now look at HI as a place to stay informed, do some informing, share our joy of collecting and our pickups with our encouraging fellow hobbyists, and stay up to date on who hates what about the card companies.
We have a great facebook group that is for HI members and a few additional trusted people. I encourage all members to join our Facebook group and contribute. It has its busier times, like when quincy posts countdowns, Ameet posts his, well lets say posts and others share pickups, breaks and other hobby tidbits.
As for Expo, it was busy and people were spending money. For me, in terms of actual cash sales it was my 2nd best ever, and I haven't missed one since 2005. I think the hobby is fine, partly in thanks to the flavour of the week collectors who are rampant on Facebook, many of whom are new to the hobby in or around 2015. But we should thank them as they are the ones who help UD sell out and breakers keep breaking, by overpaying for rookies like Pettersson, Marner, Keller etc.