Yeah. An interview (or discussion)-type show--which can be quite good given the right host(s) and guest(s)--is very doable as a hobby or a professional sideline. No need to even try to make money off it if you don't want to.

I have no idea about the future of podcasting as a business. But, just as lots of people write with no expectation of being directly paid, there's no reason to think that lots of people won't continue podcasting in the same vein.