I disagree. It's impossible to have a nation of 100% college graduates. And it doesn't make any sense, either. Just like it doesn't make sense how much the 'top' 1% are making.
No he didn't. He said that the gap between those with and without a university degree is rising. It's not the same thing.
It is almost certainly wrong to claim that the non-college educate are worse off ("dramatically" or not) than some historical period.