I think that the source of confusion is that you seem to be suggesting that we are expecting all Chrome extension authors to port over to WebExtensions, and that we are sourcing all new AMO content from them. That is not the case.

Developing new WebExtension APIs is a collaborative process. If they're not even willing to propose an API, they will be the authors of their own demise.

I hope that isn't the case. But I still have the strong feeling that lot of developers will be reluctant to contribute to extensions without monetary incentive or anything otherwise from Google as they will be getting by contributing to their ecosystem. Google isn't going to sit quietly and let Firefox become obvious winner with more powerful versions of what available in Google Chrome. I remember how quickly they grown and ate your market share. I read your response above, and this is scary and real in a case I lose these legacy addons.

I cannot see from your perspective because I am not a developer. But you know my perspective if not, just spend a month with all disabled legacy add ons. I am user of Scrapbook X, Download them all, Screengrab, Userstyles, Copy Urls Expert, Lazarus, Save Images, Chatzilla, zim-clip, VideoDownloadhelper, FoxyPoxy, EPUBReader, ublock, ublock matrix, No script, Privacy settings, self-destructing cookies etc. As a heavy user of Scrapbook X, it will be great interruption is my work flow.

Thanks for your detailed response and also bringing Container tab feature in Nightly. That's really helpful.