I think like anything there's an initial excitement that drives interest to something.. when real substance isn't quite there yet.. In this case.. content..

My and a friend did a podcast a few years back.. where we rated different alcohols and got drunk doing it.. that was fun.. but that was what I consider the 'wild west' of podcasting..

Now, as you say.. everyone is doing it.. It's a good way to cut your teeth on a topic.. but I do think it will have it's point where it become fringe again..