Next big rivalry?

Now that the whole mayweather-pacquiao thing has come to an end (rematch won't happen,so both sides stop b*tching) what is going to be the new rivalry/topic of debate? There already exists minor ones like golovkin-ward,and stevenson-kovalev,and to a much smaller extent canelo-cotto,and walters-lomanchenko,but which one will be the new big thing? Feel free to give your opinions.