Hey Jeff, I think you are right about the WP-API. I think we are going to see some very interesting solutions to a complex admin interface in the next several years.

Someone will probably come up with a simple "Medium" style interface for users to enter new content into their WP site. It could be added to the site for users who need a simplified interface. The regular admin area would remain untouched, and would be used for the WP site-builders to maintain the site.