Google is trying to kill passwords. But what should replace them?

 "You authorize your phone to allow you to log in to your account. You go into a computer and type in your email. Then you get a message on your phone to allow the login. If you hit yes, the computer logs into your Google account without a password," he wrote. 

 So , Google gets your phone number in addition to forcing you to have a google phone.  They use that phone number to authorize your email . they sell that phone number to every spammer in the world, because that's how they make a profit. Half the hackers in the world now have both your phone number and your google email address, because that stuff is for sale , cheap. Or the id number of the phone itself (the actual handset , not the the phone number) is used for identification , in which case if you lose your phone every thing locked with it is wide open. 

I know that there are a lot of people out there that don't like passwords, but locking everything with a phone you're going to hang onto for three years, and is going to cost you 700$ to change (price of a new iphone) is not the answer.