Will GMail go fully open to public

Yahoo is offering 1 GB storage space to its popular email Service. This offer will be open to all and not invitation based
Whats up GMail? When you are planning to go fully public?
Currently most of the GMail users are offered with 50 invitations. Even if you send 50 invites your quota is again increased to 50 almost overnight. It seems GMail is going public in different manner. I wonder how many GMail users will be out there?? Any guesses ??