I'm really torn on this for a few reasons:
Archives are not libraries. They have completely different mandates; they both store information, but archives are focused on preservation, while libraries are focused on usage of the items, and will weed items that aren't of interest to their community.
The definition was set, and over 300 people committed to the definition; if you change the scope, people should have a chance to drop their commitment. (ie, we don't want another Database (Professionals|Administrators) swap happening; although, in this case, we're broadening the definition, not narrowing it, so it's not quite as bad, but we don't want 10 or 20 people making the decision for 300+ people.)
There are a number of loosely linked disciplines in archiving that aren't related to libraries at all. (eg, I work in science data archiving; digital libraries and archives interest me from the technology side of things, but it has nothing to do with most libraries; my interest in libraries comes from being a member of a Friends of the Library group and volunteering in running programs at my local public library)
Personally, I think the community should decide -- once the beta goes up, if people are accepting of questions about:
- Archiving related technology (eg, OODT, LOCKSS, iRODS)
- Records management
- Classification theory
- Ontology/thesaurus design
- FRBR / FRAD / RDA
.. then we can broaden the definition. We just need to get the site up, and people to ask those questions, so we can see how the group reacts.
The biggest problem that I actually have isn't so much this question directly, but that there's another question about merging the 'books' proposal ... and I see these two suggestions as being conflicting; we either try to move towards more professionals, and even maybe the academic library/information science theorists ... or we go towards the general reader community. We might be able to pull off one or the other, but I don't think both are a good idea ... and I see a higher affinity with the 'books' proposal.