One area that it probably won't expand to, but I would see value in such a service, is an annotation system on legal texts -- statutes, case law, law review articles, et al.

When I was last able to use WestlawNext (almost two years ago), I think it supported personal annotations. Distributed annotations, though, might help me understand the differences in Hong Kong's definition of personal data in Cap 486 versus other definitions in other legal documents.

And it could provide some humor when reading the Alabama state constitution.