What Happens After High School Musical 3?

I think that after High School Musical 3 the whole cast will be leaving Disney Channel for a while, they will not be returning for High School Musical 4. Ashley Tisdale still stars in the series Phineas And Ferb. Zac Efron, Vanessa Hudgens, Ashley Tisdale, Lucas Grabeel, Corbin Bleu have other movies that are coming out next year

Zac Efron
Seventeen Again (2009) February 20th
Me And Orson Welles (2009)

Vanessa Hudgens
Rock On (2009)

Ashley Tisdale
They Came From Upstairs (2009) February 13th
You Wish (2009) March 3rd

Lucas Grabeel
Release (2009)
Lock And Roll Forever (2008)
The Adventures Of Food Boy (2008)
Milk (2008) November 26th

Corbin Bleu
Free Style (2008)