Right, they will not expand the specific to a general, as some here think Bush should have argued for. What will happen is, if they find for the complaintants in the UM case, it establishes once and for all that using race in any way on admissions is a violation of equal protection.
They only have to rule on the one case, and it establishes PRECEDENT for all future cases. Once that happens, universities wishing to avoit being sued will adjust their rules. A few may be sued, but with the precedent established, the colleges would lose.
This is the way it always is with the Supremes. For example, Roe v. Wade was a ruling on a specific case, but it set a precendent for abortion litigation across the country.