I’m guessing those people would all be succeeded by their next of kin. Would that cause a wave of change or…?

Something would happen on the micro level. Some families would fight over the power vacuum, other families would slowly fall into obscurity due to the loss of a loved one, some might spend resources to track down information, some might a come to Jesus moment about the wealth, etc.

Would anything change on the macro level? Doubtful. New people will rise to the top as the system that created unimaginable wealth still exists.