I wish they had just fixed the experience for "vanity domains" so that they didn't require all the enterprise features, and didn't let administrators have complete control of users accounts. Then they could roll out new features to vanity users without needing the enterprise controls.
I understand that this is a little tricky, and involves no paying customers, but Google Apps was by far the best experience for custom domains. I'm sure it attracted the type of influencers that pull even more users. I used it for my family, bands, friends with very small businesses and more, and the other people on those domains not already using Gmail, in turn migrated their personal accounts to Gmail.