I'd be interested in a podcast app that allows me to subscribe to written RSS content and uses AI to (transparently) convert them to audio podcasts.
The time/attention it takes to engage with written content can be a barrier for me. The hands-free experience of listening to something is so convenient, I find I engage with audio far more often than written text.
The only major downside of audio is the challenges around notetaking, and recording the snippets of info I want to hold onto.