It would actually be a disadvantage for juventus.
In Conte's first season, we won scudetto, and we were in the third ? pot due to no or poor european campaigns the past years.
With that rule in effect, we'd be pot 1.
Here is the deal. Consulting current Uefa club coefficiënts
we can see that after this season, juventus will be miles ahead of any serie a team. We are going to whipe out the 10/11 this season and the noshow 11/12 wich will easely put us in the first pot.
Wether we win the scudetto or not, we are in pot1. As long as we keep passing the groups and qualify for CL, we'll remain in pot 1.
Other italian teams , are far from pot1. For them the scudetto suddenly becomes pretty damn important. Not only are they in the group stage, but they have a very good chance of getting a pot3 opponent they can realistically defeat.
And finally its bad for serie a. Cause now even more teams will skip the europaleague games to attempt that scudetto that brings these added advantages of pot1.