I empathize with this view - but I doubt this will ever happen. Ignoring the user training bits, and the legal bits (who is a mod, how do they do stuff), you need to have someone dedicated to fighting this though the IT/Security gauntlet. Now keep in mind im private sector (so it's slightly different) - but we in IT generally have dimm views of hosting WebApps.
All that said. Once one local gov does it the potential for it to spread radically increases.