Posting abandoned research ideas

Researchers often hold onto sub-par research projects for their option value. An idea might not seem worthwhile now, but maybe in the future (it might become feasible with better data or theoretical breakthrough, or might become more interesting if combined with another insight). But periodically, this option value drops. After a professor gets tenure they're probably much less likely to care about these long shots. Sometimes these ideas are lobbed at students, but they are often not picked up. I think that at these points where the option values drop, professors should post some of their least-likely-to-be-worked-on ideas somewhere. It could be their own blog, or a maybe an aggregator that specializes in abandoned research ideas.