Well, I hope you're right. I'd love to see smarter, better SF on TV or whatever the alternative is.
However, there's a huge discrepancy between film/TV and podcasting. It's a bigger collaborative effort. Instead of a story, a reader, and a producer there's a script, actors (plural), a producer, a director, effects, cameraman, boom operator, editor, etc. Some of these jobs can be combined but it's not a one man thing. The guy who made Sky Captain spent 5 years of his life making 5-10 minutes by himself, IIRC. He ended up getting help from a studio because he realized he'd die before the project was finished if he kept going at that rate.
The other contrast between the two is that, with Steve and Escape Pod, he was able to build a fanbase on a relatively low budget. (I think Escape Pod started off paying $20 for their short stories. I could be wrong. I know it wasn't $100.) Steve paid a sum of money for a story because he wanted quality. With the film/TV alternative is going to need a bigger budget upfront to get that same kind of quality, because there are more people involved. And because it takes more time. So the question is how does an alternative film/TV company come up with that kind of money, just to start out? It's not like Steve Eley's asking for my money. I'd give it to him because I trust him and his track record. But an unknown TV/film company trying to make a quality SF/F product with nothing to their name is going to have a tougher haul and loads more money to raise.
Finally, I've got to take a little bit of issue with you bagging on SAG. SAG and other unions (like the SWGA) may seem like a pain to you but they really do take care of their members and help protect them. It's not about Tom Cruise and Brad Pitt, it's about my buddy from college who's only managed to land bit parts in films but is able to get some kind of working compensation while he pursues his dream.
Like I said, I really hope it happens but I haven't seen it yet. I'm a big fan (and sponsor) of Stranger Things but I don't think they've hit their stride yet or could really battle with the networks. I actually don't know if I think there's going to be a battle. I don't think TV networks are going anywhere. I just think there will be more alternatives (and maybe even, for shows like Firefly, a chance at a second life).