2. Agreed but this has nothing to do with Twitter or mega-apps whatsoever.
3. Transitioning to cloud service is not what Twitter needs to do right now even under the mega-app vision. And attempting so under their current situation is a sure fire way to actually go bankrupt.
Mega-app, the way I understand that term, is not what he's after. He's mentioned that he wants to allow HQ video and compete with YouTube and have a separate app which shows a YouTube-like view of only tweets with videos on them. Like a projection of that content, from the same platform.
Or alternatively you can see it as merely a "videos tab" in a single "mega-app", but this distinction is not quite substantial on a higher level, only about the logistics of marketing the app and maintaining it.
As for there being zero building happening... of course. He's trying to stop bleeding cash for now. I'm not suggesting he's working on this NOW.
1. A general purpose computing platform is an everything app. 2. Cloud platforms and their APIs are a significant step towards moving higher-level in development platforms compared to, say, compiling a raw binary and running it on Linux. 3. Keep moving in that direction.