2) The plethora of potentially World Class talent :
The rise of the Italian league is not just because one of the two best players on the planet decided they want to ply their trade there. No, despite it being a huge factor, that's not the only thing that has brought Serie A into the limelight. Italian teams are producing and/or purchasing a lot of great talent who are making it more appealing for a global audience to tune in and watch these superstars play.
Also, like the hallmark of every good league, there are a few minnows who love causing an upset when they're throwing punches above their weight class (AS Roma just lost to SPAL at home!).
Teams like Fiorentina, Lazio, Roma, Napoli, and Milan have seriously strengthened gradually and are in possession local or homegrown talents that are chased by global powerhouses such as Manchester United, Barcelona etc. Serej Milinkovic-Savic, Federico Chiesa, Alessio Romagnoli to name a few have decided to grace the Italian top flight with their talents.