If any had a crack before sale, fault is easy to assign.
Those who purchased after the problem was well-known also probably have recourse.
Certainly the concrete supplier and potentially those who poured it are not likely to face any jeopardy after 30 years.
But it's likely there were some home sellers and inspectors who are at risk.
And, of course, the banks holding the mortgages. They're screwed.
I wasn’t clear .. I meant hard to find fault with the original quarry and concrete maker who did the job 30 years ago... yes, if anyone recently sold a house (or inspected a house) that had the kind of damage described here without notice to the buyer, I believe they’d have a cause of action.
Just hard to imagine your house crumbling under you, but it DID happen to a friend, here in VA. Shoddy work by a crook. At least it was a vacation home, not their primary homestead. I *think* it was resolved in the courts. But that’s quite different from having your house crumble after 30 years!