I'd love 8 movies! I mean, how many Superman movies are there now?
Also, there are now 11 movies with Jason Vorhees in them, Friday the 13th Parts1-8, Jason Goes to Hell, Jason X, and Freddy Vs Jason.
So why not 11 Spiderman Movies? Plenty of villians, or why not more? How many Bond movies are there?
As long as they don't suck, or have enough fans calling for them, why stop making them?