When Fizzer first announced the update and the mods feature I was overjoyed. The mod system is actually quite amazing and we have seen some great mods uploaded and the update in general is superb. The mod system has an existential problem though. By making it members only, it is impossible to fill a modded game in a timely manner. I am not complaining that only members can use mods in their games, that is fine. But the fact that non-members can't even join modded games makes the feature essentially worthless. So my question is this: Are there any plans to ever open up modded games to non-members?

Yep, there already is. Check the box on the mods section, "Allow non-members to join"

thank you!