I would contest your statement about the online experience. I'm actually in contact with more of my classmates from my online MAEd than from my on ground MLS. In neither case am I still in contact with any of my professors. In both cases I was in school primarily for the certification. While I probably learned more content in the MLS, I had more challenging experiences with the MAEd. For the most part, I enjoyed my online courses--they also eliminated that frustrating issue of thinking of something for discussion 2 hours after class was over! Humor aside, the discussions were definitely better online, with everyone participating, and not dominated by those who raised their hands the fastest or talked the longest.
I'm more concerned with the "digital divide" issues with online education. At my urban university, I work with plenty of students who have neither the computer experience nor the equipment access to adequately handle an online course at the start. For instance, there are few scheduling advantages to an online course if you have to conform to the schedule of computer labs and public libraries for computer access, especially when working full time. You can only "do your classwork at 2 in the morning" (as the marketing says) if you can get on a computer then.
There may well be a division, but I suspect it will not be as simple as you propose. Well off students can afford to go to "good" schools and will be able to supplement their local classes with whatever online courses they wish. Not so well off students, who can afford a decent computer and get computer help, will be able to take online courses and take advantage of the variety and range of courses, even if their on ground opportunities are limited. Poor students will be stuck with whatever is available locally, good or bad.