What changed things? WordPress Multiuser, with DNS wildcarding so people can have their own blog subdomains such as dlnorman.ucalgaryblogs.ca.
The result? Takeup, from a stealth project with no budget.
And what have we got? Plone. Not even Plone, but Plonk, the UoL crippled implementation of Plone.
It ain't gonna happen here people.