The podcast market is huge and it's growing at a steady pace. There is now a podcast in almost every subject and new ones are being started almost every day.
Podcasting is only going to get better and bigger from here. This .org TLD with pod and hub in the name is a great and easy to remember domain name for the podcast niche with huge long term potential.
Great news! Domain PodHub.org has been registered in the past and previous domain owner(s) may have forgot to renew or dropped it.