Interesting article here on the number of deaf students in higher education:
 
http://jdsde.oxfordjournals.org/content/7/4/267.full.pdf
 
The authors state that there are about 25,000 deaf (including hard-of-hearing) students in U.S. universities, and a few paragraphs later gives the number for Gallaudent and RIT, which amount to slightly more than 10% of the total number.  That is a lot, you'd have to admit.  Still, that means roughly 90% of deaf students, about 22,500 or so, are in other schools.
 
An interesting point a bit further on in the article is the reason why many deaf students drop out:  inability to decide on a major.  Probably many non-deaf drop out for that reason, too.  
 
I would guess that you are right, shushugah, that there are not many deaf students in the highest-ranked schools.  However, in my opinion, that might not be so terrible.  Better to complete a degree in an average institution than be overwhelmed and drop out of a first-tier one.
 
If you finish your degree at MIT (is that where you are going?), then kudos to you for that, because that will be a wonderful accomplishment.  Not many people, hearing or deaf, will be able to do that.  I hope you do well.