I agree. But currently the “wiki” feature applies to posts, and not topic threads.
This just shows that the autoclose feature, in practice, has unwanted side effects.
Users with high privileges (sages, etc.,) should be able to switch off auto-close if they are creating a perpetual discussion or help thread (and do not intend that there ever be a post marked as a solution.)
OR
Auto Close should only apply to solved threads.
@sam, You may have missed the general discussion in this thread (where I’ve restated my 2 thoughts above.)