YES. The Silmarillion would tie up the other things alluded to in the scripts of the first six movies. I wonder if he would include the kin slaying an the betrayal at the ice flows. That would be cool too. Galadrial was one of those who survived crossing the ice in the north and came into middle earth. So many things to choose from...where to start.
I would love to see Gondolin, Nargothrond, Beren and Luthien, and the fall of Numenor. However, Jackson doesn’t hav e the movie rights to the Silmarillion, and I believe Christooher Tolkien won’t sell them.
Of course, the Silmarillion is not a continuous narrative — perhaps it could be done as a series of hour long shorts?