Not necessarily - if you assume there are more qualified entrants than there are seats available (as is true for MIT), then scores could be unchanged - e.g. there could be, say 200 students in line to get in, all have 1600 SAT scores, 100 are black/Hispanic; 100 are Asian/white. Now the question is what is your tie-breaker - the old tie-breaker was Affirmative action, so more of the former got in, the new tie-breaker is, say, volunteer work, and more of the latter qualify for that and get in