Based on the Forbes article, and assuming that the colleges in danger of closing are the ones with the D and D- grades, it looks closer to 1/4 that 1/2. Moreover, as more colleges close, the enrollment in the remaining colleges increases. So as some close, the situation of the remaining colleges will improve.
Also, many of those schools are religious schools, which may be bailed out by their mother religion. So Yeshivath Viznitz, with a C- grade, is the Yeshivah of the Chassidic dynasty of Viznitz, and they will not let it close. If its funds start running out, the Rebbe will run a fund raiser, ans the money will come. I’m not so sure about the different Dominican universities, but if there is a Catholic order with a LOT of money, it’s the Dominicans.