Evidently, Dana White wanted Mayweather to call him, if he is interested in fighting Conor McGregor, but I think Dana White did this more to interject his name into this potential super-fight rather than to actually try to prevent McGregor or Mayweather from fighting, and making money.
There is a lot of money to be made in the actual fight between these two super athletes, so I'm sure Dana White would not want to prevent all that cash from coming into the UFC.
Right now, this is under the category of potential super-fight rather than just super-fight. A super-fight should be understood to mean a fight between two super athletes that is already signed, and ready to be officially promoted.
A potential super-fight should be understood to be two super athletes entertaining the idea of entering a super-fight.