This is very good news indeed—Google are going to allow non-AMP pages to get the same prioritised treatment as AMP pages …if they comply with the kind of performance criteria that Tim outlined.
It’ll take time to get there, but I’m so, so glad to see that Google aren’t going to try to force everyone to use their own proprietary format.
We are taking what we learned from AMP, and are working on web standards that will allow instant loading for non-AMP web content. We hope this work will also unlock AMP-like embeddability that powers Google Search features like the Top Stories carousel.
I just hope that this alternate route to the carousel won’t get lumped under the banner of “AMP”—that term has been pretty much poisoned at this point.