Its already happening except this time its standing desks for $100 vs $1000. Keep an eye on craigslist in SF, I've picked up a few for home and keep seeing more pop up. Each time its been a tech startup that has failed, so I guess we should start worrying when its established companies listing their office furniture on craigslist.
Craigslist seems to be dying as people use Facebook Marketplace, OfferUp and LetGo to buy used items. The end of the personals section combined with heavy advertising by the aforementioned new entrants is causing a slow user bleed from Craigslist.
And the terrible user experience of having a stranger say "I know we agreed on $200, but now that we've half way loaded it into my car I think $150 would be more fair."
Terrible experiences happen to me way more on the newer platforms I listed. People are literally crazy on those new platforms, I've had death threats (from a user which OfferUp never banned) and various other threats on those 3 platforms. Facebook, OfferUp and LetGo all ignored my complaints.
Craigslist over the past 2 years has had zero issues, I've interacted with fairly even keel 40+ year old people that are easy to work with. The "no lowballers, I know what I got" crowd has mostly departed Craigslist.
