3 at most, I give him this year and next 2 years after that. But at that point Quintana and Joe D will take over (Henao, Betancur, Kwiakowski, Pinot, Talansky, Tejay as well, but those 2 are the main ones).
Give Quintana one more year after this year to come into becoming a GT contenders, then one more where he can focus on podiums/wins in Giro/Vuelta. And after that he will be able to start winning the Tour in addition to Giro's and vueltas. And Dombro will be ready to start his reign by then too.
