imo, the easier and more likely-to-be-successful podcast idea is to press successful people on times they failed. Very few are going to be "first at bat, hit a homerun"; those people are not as interesting anyways to interview.
You solve the credibility problem (they ended up successful) while still distilling down the more valuable failures.
You solve the credibility problem (they ended up successful) while still distilling down the more valuable failures.