The tail mounted engines still is better for Pax comfort and gives a cleaner wing design.
Just look at the Global, and tell me I am wrong.
The problem with tail mounted engines is you need to know - to a very high level of precision - the engine weights very early on, and that's seldom the case. If the engine weight changes you end up carrying large amounts of ballast to keep the CG proper. Former MacDac guys tell me that's what ruined the MD-90 - late regulatory changes regarding blade out increased the engine weight by nearly a ton - which then required almost two tons of nose ballast to compensate.
Wing mounted engines are near the nominal CG so you don't end up paying twice when the engine weight inevitably goes up.