I don't see this signing so much as a CL guarantee (that's naive) as I see it as a game changer for Juve and the Italian football in general. It will affect our future signings, our marketing, and the overall atmosphere in the league, which Juve will certainly benefit from. We could still win the CL without Ronaldo but even that wouldn't improve our game in those aspects I mentioned as much as such a once in a lifetime signing would. We used to have all those superstars before Calciopoli, Ronaldo will help us get back to where we belonged.