Whether they are joining forces or not, it's always the same 2 - 3 thousand people that actually listen to pinball podcasts.....does it really matter? I don't think this will spark any more interest if that's what the plan is. They're not going to get together and suddenly 100,000 people are going to start listening to people talk about pinball.
I also think that having a set schedule burns people out. You put unnecessary deadlines and pressure on yourself and I can see how that can suck the fun out of it after a while, especially when there's often not much material to work with.