I have just started doing podcast interviews but I can relate to this. Being a rookie in the Podcast business, I have been stood-up a few times already.
What I am finding most difficult is to get my interviewees to committ to a time schedule. I ain't calling it quits yet, but when I saw someone else going through similar pangs, I couldn't resist comparing.
BTW, I like the way Walt Mossberg handled my request for a podcast interiview. He immediately responded with a simple no.