No, I don't think that what going to happen to Callie with the car accident should be something that should happen to Meredith, because Meredith already had two near death experience, the bomb in S2 and the drowning in S3, not mention that she already had two operations, the appendicitis in S3 and the liver donation in S6. I think it would be too much if Meredith is involve in a car accident too. It would be a case how many time can someone be near death and not died. It would be quite ridiculous.
Callie being involve in a car accident, is a case of "it was time for Callie to have her near death experience" type of case. After all most the characters on this show had been a patient in the hospital once or twice. Mer in S3 twice, S6 once, S2 almost became a patient because of the bomb. Cris is S2 when she had the miscarriage, Alex in S6, Izzie in S5, Derek in S6, Richard in S2, George in S5, Bailey in S2 when she gave birth. So Callie in now going to become a hospital patient because is her turn to be a patient.
Mark and the Chief argue on Grey's Anatomy Season 7, Episode 18, "Song Beneath the Song.