Closing the door to the country club works if you're already inside when the door closes. Google's agreement with Verizon positions them inside. Startups and companies offering services we haven't even dreamt of yet are on the outside.
No part of this agreement creates any business relationship between Verizon and Google. I'm still not understanding.
Since Google dominates current services, it doesn't need to monopolize them, just ensure that anything new coming along has some hurdles to clear.