Then people would be crying about how either the teams are identical after 4 years, or that the teams have lost so and so players over the year and isn't fair. Plus, knowing EA's logic, you'd get drafted by the Packers who have Rodgers, Brees, Manning on their roster after 4 years and you'd be 50 ovr and starting QB.
You could always make a roster from 4 years ago for NCAA and play through as if you were in the 2010 class. Heck, my QB played with generated names so it didn't matter at all.