"(number most commonly used words) ^ (number of words)" is exactly what the comic uses. Notice how the words have the same number of bits of entropy in the "correct horse battery staple" example, even though they're different lengths. Did you read it? I believe he also has a "blag" post explaining exactly how he came up with the numbers.
I agree with your link, though, that it's extremely frustrating when websites have policies that prevent certain password options, like alpha-only passwords (even if long) or passwords over a certain number of characters.
To 1, 2, and 3, you are correct. I am also not a fan of his proposal. I tend to believe economies will function better if the government is not needed.
To 4, there is no reason why Kickstarter couldn't work without copyright. There would probably be no tier of "a download of the album", but that's not a necessary tier. Most of the money will probably be made on the physical items or exclusive intangibles for sale anyway. And people still want their favorite artists to create things and earn a living.
One reason I gave my congressman that I opposed this bill is that it didn't contain safeguards to keep the information from being used to prosecute other types of crimes which were not in any way related to "cybersecurity". Based on the amendment, that was apparently intentional.