Could there be different power levels to the vampires?

Will the story continue after all the friends get turned into Vampires?

For example there could be new future plots if the story did continue: Such as the new circle of friends who are now all vampires, have to protect the rest of the vampires against the human race as they see the vampires as a threat?

Or

The new circle of friends who are now all vampires have to protect humanity from a group of powerful vampires who wish to convert all human beings into vampires and thereby eliminate a source of blood for vampires. This could be bad because then vampires could starve after suddenly losing a main source of nourishment and unable to adapt in time to save themselves. 

Anyways after that mouthful, I'd like to say I'm interested.