I think that a ton of people are going to find out that their SSS technique fails when they don't use k-of-n and then one of their friends loses the piece of paper. I have a hard enough time keeping my "absolutely critical credentials" doc safe through things like house moves. I can't imagine relying on several different people to all do this perfectly for wealth that isn't actually theirs.

SSS is precisely the sort of "wow sounds awesome" thing that would capture the attention of geeks without really deeply thinking about the most likely failure modes.