> I am suspicious of any of the for-profits being able to sustain a business.

Blackboard has been around a long time and seems to do okay. Instructure (makers of Canvas) has done very well. Both sell Learning Management Systems (LMSes), not educational content itself. Big textbook publishers, like Pearson, have been managing incorporating online educational materials.

But yeah, don't expect a unicorn to come around and "disrupt" education.