I've coded a large website using this approach (WP + ACF + WPAPI + Backbone) and while it definitely helps, it shouldn't be considered the future. We shouldn't be relying on a plugin to extend the concept of posts within a blog CMS.
The future would be Wordpress pivoting into a CMS that can accommodate for a wider range of content, that drops posts and embraces the customisability the community has been providing through these high installation plugins. I remember reading somewhere that Wordpress is trying to become the 'OS of the web', and I applaud that. I just hope they do it in a way that accommodates for sites that don't fit the blog model.