These are (roughly) orthogonal issues: regardless of whether we support SSH or not, we are going to support HTTPS access to Git repositories. And if we support HTTPS, we must support two-factor authentication. A lot of organizations require this. (In fact, Microsoft itself requires this internally: our authentication to any internal web site uses 2FA.)
So Visual Studio Team Services must support HTTPS with two-factor authentication. This is awfully painful to use git core on the command-line without a credential manager to assist you.
These are (roughly) orthogonal issues: regardless of whether we support SSH or not, we are going to support HTTPS access to Git repositories. And if we support HTTPS, we must support two-factor authentication. A lot of organizations require this. (In fact, Microsoft itself requires this internally: our authentication to any internal web site uses 2FA.)
So Visual Studio Team Services must support HTTPS with two-factor authentication. This is awfully painful to use git core on the command-line without a credential manager to assist you.