Already is. I noticed the Google Blocklist was broken explicitly because I was trying to remove Quora from my results. Quora is another example of a company/site imploding.

I don't understand this comment. Quora doesn't show up in results bc they're not in the index, it's a private site. Unless that's changed?

They seem to be showing up for me. I don't have any recent organic examples, but here's query for one of the most popular threads, and the quora thread is the first result:

https://www.google.com/search?q=How+do+I+get+over+my+bad+hab...

What do you mean by "private site"?

The other objectionable/EE-like thing about it is how it hides the answers unless you log in. That really sucks.

EE never hid their answers. They were only obfuscated. First[1] they made it look like the page ended, but you could scroll further and get the answers. Later, I saw that they had a section that looks like the answers, but all of the text was blurred. Again, if you scrolled past the 'end of the site' you could still get to the answers.

Looks like Quora gives you the question, and the first answer, but all other answers are Private-Only.

[1] I think that in the beginning they may have really hidden their answers, but were forced to actually show them by Google.

If you add ?share=1 to the end of a Quora URL you can get the full content.

They do show the first result even if you are not logged in (there is a dismissable modal popup that forces you to register though). Google indexes first result and that makes quora pages show up in relevant searches.