3- Make the WP core and plugins "talk" to each other as easy as IFTT: a visual way to use hooks and API.
Example: I want to improve the email my site sends, then I search "email" I will see emails related roles (design, composing , send services, etc). There I can see that MailPoet plugin has the "design", "composing" and the "newsletter" roles, so I could use MailPoet in what roles I want. I can see too that I can send emails from my own server, or get "Mandrill" to send them for me, so it will release the load from my server.
I choose what I want, click to install and see it in the dashboard roles graph in my site.