No. Podcast is booming. And podcasts are distributed via rss. Every podcast player is basically a rss client.
There are many hosting companies that will create friction and pain if a consumption platform attempts to vertically integrate and eliminate the idea that you can publish a podcast on any web server, but we're already in a world where some of the consumption platforms have distinct flavors of RSS published especially for them.
Not hard to imagine one of them offering better support if you use a more custom integration, which it's not impossible to imagine major hosting providers building.