Nonexisting Film Sequels

With so many sequels bursting about, there are still some I would love to see.

Back to the Future 4
Bad Boys III
Beverly Hills Cop 4
Clerks III
Ghostbusters III
Goonies II
Lethal Weapon 5
Mallrats II
Men in Black III
Star Wars 7-9
Zorro III

I think the following films will occur at some point;
Austin Powers 4
Indiana Jones 5
Jackass 3
Meet the Little Fockers
Mission Impossible 4
Pirates of the Carribean 4
Spider-Man 4