I would say there are things we can do to our direct benefits, and less costly.
Regarding copyright, yes, perhaps many Wikimedians do have concerns about strong copyright protections like the lenths of protection, copyright for non-creative aspects of database, anti-circumvention prohibition, and potential expansion of indirect infringements are discussed on mailinglists and on various pages.
But copyleft licenses and their likes (such as CreativeCommons Public Licenses, not all of which are copyleft) enable us to deal with that strong protection.
It is more directly to our benefit to promote GFDL, and we do not have to influence any legislation to do that.
Also, it is very beneficial for us to help FSF to revise the GFDL so that we have more flexibility regarding its requirements, though I know English wikipedia interprets it rather liberally, and not having serious problems.
As a sidenote, regarding the length of copyright protection, I am not sure if the shortening of the protection period would result in an immediate release of currently protected works into the public domain. When I see the legal texts and relevant court cases, it is often decided that legal changes do not affect the already copyrighted works unless it is beneficial to the authors and other copyright holders (But I know mostly about Japanese stuff, so it may be different for other countries).
We can also try to solve digital divide without lobbying. We can promote and distribute our free content. How about a promotional team who can talk to potential users about our content and answer questions they might have, introduce them whom they should talk to for technical, legal, and other questions?
Regards,
Tomos