I've had similar experiences to you -- I haven't always fanned on closed-canon shows, but SGA was the first open-canon fandom in which I wrote more than an occasional one-shot episode tag, and I did have to adjust my way of thinking to accommodate it.
There are lots of examples of closed-canon shows that still have active ficcing communities, but they always do contract when canon ends, and I think that's what's scaring people about SGA right now. However, I think that SGA fandom was big enough to be fairly resilient now that there's no new canon, even if some people leave. I did feel like we had leveled off as a fandom in the last couple of years anyway -- there were a few new people coming in, but not really very many, and perhaps not even enough to offset the number who were leaving. So I think overall, there is probably going to be a noticeable shift in the whole "feeling" of the fandom, and probably, yes, a contraction as people drift off to other things. But I definitely think there will be enough people left to still have an active and lively fandom.
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I've had similar experiences to you -- I haven't always fanned on closed-canon shows, but SGA was the first open-canon fandom in which I wrote more than an occasional one-shot episode tag, and I did have to adjust my way of thinking to accommodate it.
There are lots of examples of closed-canon shows that still have active ficcing communities, but they always do contract when canon ends, and I think that's what's scaring people about SGA right now. However, I think that SGA fandom was big enough to be fairly resilient now that there's no new canon, even if some people leave. I did feel like we had leveled off as a fandom in the last couple of years anyway -- there were a few new people coming in, but not really very many, and perhaps not even enough to offset the number who were leaving. So I think overall, there is probably going to be a noticeable shift in the whole "feeling" of the fandom, and probably, yes, a contraction as people drift off to other things. But I definitely think there will be enough people left to still have an active and lively fandom.