Yeah, there will likely always be old Thiel speakers available on the second hand market. But Jim’s last great Thiels, the 3.7 and 2.7,* are damned rare on the market now. I’ve been keeping track. When I look at my 3.7/2.7s I think "whoa I’m lucky to have these."
And that was reiterated once again as I was out speaker shopping this week. I heard more contemporary speakers from $4,000 up to about $30,000 and none of them sounded to me as good as the Thiels. What a crazy bargain the 3.7 was in particular.
(*I know the 2.7 was partially designed after Jim's death, but it obviously carried on his work).