I think that regular users should be able to "claim" a stream if:
A. There are NO mods / owners
B. All of the mods / owners have been offline for at least 2 months. I hate finding a stream that I want to post something in but the only owner has been offline for 2 years, 4 months, 1 week, 3 days, 9 hours, 18 minutes and 32 seconds.