why there isn't numerous of online course in a typical college in US?

why there isn't numerous of online course offer in a typical college in US for another student option?

It is cheaper, more profitable and more efficiency and student don't had to spend time travel to college except. Student can totally handing in homework online and colleges can just open up a lot of computer lab for the student to take exams in exchange and lay off some lower quality professors. Students can have more time themselves to interact privately and all the formal discussion can be discuss within the class.

Also, government can pay less financial aid and student can even learn the class material in a cell phone.