Watching him destroy that site is quite astonishing. I've never had an account with twitter. It never appealed to me. Making it a requirement to have an account to even see content isn't going to convince me to sign up.
Since many companies use twitter as their mouthpiece on the internet. I wonder how they're going to react when they're now only able to engage with registered users. I'd be surprised if this works out well for the company to be honest.