That's a great idea...but the one issue that comes immediately to mind is copyright; at least for some of these event hosts, they sell their MP3s after the actual call - in fact this woman I noticed was selling her recorded classes - only about $10...
As *soon* as I'm in the States I'm going to be working double time to get some amazing guests for all of us, for scheduled chats and I'm starting to look into a teleseminar line as well as one guest I *really* want everyone to 'meet' isn't big on typing

she'd rather do a call.
Anyway, when the time comes, in those cases, we'll have full transcripts and recordings of all of our own events for certain.
If you see a class you're really interested in attending but can't, I'd suggest following the link to the event provider's website and check to see if they archive their own classes for free and/or sell them. And if not, it never hurts to ask