The page results will be a tightly restricted iframe-esque window inside of google results (This is what the Chome "Portals" proposal is about).

There will be no obvious distinction between a search result and google's own website, even though the "portals" will be showing cryptographically signed content (which will almost certainly be in a super restricted AMP-esque format that denies sites much control besides what the text says)

If google swaps one result for another, 95% of users wont even notice.

> If google swaps one result for another, 95% of users wont even notice.

Right so exactly the same way the search results page works today?

> The page results will be a tightly restricted iframe-esque window inside of google results

This is completely independent of AMP. Portals work for non-AMP content too.

> which will almost certainly be in a super restricted AMP-esque format that denies sites much control besides what the text says

So you're suggesting that Google will create a new, even more restricted than AMP protocol to be viewed on the search page?

Isn't that what those meta tags are for so google can quickly show scores, reviews and stuff?