Melo is a far different type of scorer than Wade. Lebron can handle the ball and just find Melo for open jumpers and feed it into him in the post at times.
As a Sixers fan, it seems delusional but they have every thing there to make it happen. They could sign someone like Mike Conley, trade Okafor and/or Embiid for a stud 2 guard, then have Melo, Lebron, and Noel at the 3,4,5 and still have a great young core...possibly Ingram who knows the possibilities are endless when a star finally decides to sign with them. $50-60 mil in cap space, good young core, a ton of picks (possibly 2 top 5 picks).
Just for the fukk of it
Trade Okafor for Devin Booker or D'angelo Russell
Mike Conley (or Russell)
Brandon Ingram (or Devin Booker)
Melo/Bron
Bron/Melo
Noel/Embiid
Saric
I dont feel like going deeper into the bench but that team would be deadly.