Was it standard practice in decades past to connect hot conductors with crimp devices?
Somewhere between the practice of soldering / taping and the use of wire nuts, Barrel crimps were used to make joints in smaller wire.

If they are done properly they should last a lifetime. Just as any other compression type lug lasts. Millions of ring/fork type lugs are sold and used every year without incident unless they are not crimped tight enough. Then they can heat causing expansion and contraction and eventual failure.

Inspecting the electrical system for more failures would be prudent but I wouldn't rush to replace every joint in the house. If the wires are tight and there is no sign of excessive heating of the joint then they outlast us all.

Good luck and stay safe!