How easy is it to leave Zotero? (Either to move to a different paper manager, e.g., Mendeley, or to leave the paper manager ecosystem entirely.)
Can Zotero respect my filesystem organization (à la Lightroom)? I have thousands of papers organized, and don't want to move them all in (too much work, what if I don't like it?), but I also don't want to have two copies of some subset of the papers, which might not be in sync.