They gonna continue to make them.
It is a decent franchise, the first and second were great, third good and fouth ok. My point is according to Mojo box office they all made big profits after production costs. Mojo Box office figures only cites domestic and worldwide theatre sales. Not DVD revenue.
http://www.boxofficemojo.com/search/?q=scary%20movie&p=.htm
So love them or hate them. They gonna keep on rolling unless next one flops big time.