Ask HN: Building the next generation PaaS

Inspired by this John Gruber quote

"Cloud computing is one potential path forward. The cloud is nascent, like the PC industry of 1980. In 30 years we’ll look back at our networked infrastructure of today and laugh, wondering how we got a damn thing done. The world is in need of high-quality, reliable, developer-friendly, trustworthy, privacy-guarding cloud computing platforms. Apple and Google each have glaring (and glaringly different) holes among that list of adjectives."

http://daringfireball.net/2014/02/microsoft_past_and_future

What features is a PaaS like Heroku currently missing?

What feature set would make up the most optimal PaaS?