I think that in 30 years the 5 families from New York will still be there unlike some families like Decavalcante, Detroit... But their strength will have diminished I think only the Gambino and Genovese will still remain respectable families.
I think that the Ndranghetta is already there and will be even stronger in 30 years already we can see it in Canada which have surpassed the Cosa Nostra and the Ursino of Gioiosa Ionica is already well established in New York and claims the 6th family .There is also the Aquino-Coluccio clan and the Commisso clan which are established in New York and which I think over time will still grow in importance in this city and in other large cities such as Chicago, Philadelphia ..... ..
Other Italian Mafias I think that in 30 years the Albanians, Russians (Ukrainians, Georgians....) will be stronger than today and they will surpass some families from New York except as said above Gambino or Genovese.