If the AI bubble pops it's just another bubble like the many ones that have occurred throughout history and the market eventually recovers.

In the AGI Succeeds scenario, the situation is unprecedented and it's not clear how it ever gets better.

Tbh, the answer is simple: if we truly get AGI, the government would nationalize it because it's a matter of national security and prosperity for that matter. Everything will change forever. Agriculture, Transportation, Health... Breakthrough after breakthrough after breakthrough. The country would hold the actual key to solve almost any problem.