In reply to Jeff Chandler.

Re: save, share, re-use of templates...Of the page builders I've tried, Divi has the best functionality - but the lack of ability to add in other modules is underwhelming. In order to improve the "drag & drop" scenario, we need to also work on integration questions for shortcodes, widgets, "content blocks", etc.

I think the attempt to bring all of this out of the theme code and into config / content is a positive direction for the general usability of WordPress, but without more core support will struggle to find an optimal solution. Look at Custom Post Types...They have solid core functions which have helped a series of great plugins like WCK, ACF, CPT UI take shape. That model works, but is becoming a victim of its' own success as typed meta fields and theme functions to output them are now being actively considered in http://make.wordpress.org/meta/.