That's very true, anything can happen in three years. But just as bad things can happen to Emily's competitors, bad things can happen to her, and considering she's older than them all (Kimmie, Ashley, Rachael, Caroline, Mirai) -- in general being older puts you at a greater disadvantage, because you're more prone to injuries, slower to recover from injuries, harder to gain/perfect new skills, etc.
I think it depends a lot on what happens at this coming National's. If Emily gets on the podium, she will probably be optimistic and keep training. Mirai & Rachael might be slightly off after having skated junor LP's all season and anyway these 2 have not been consistent (with their jumps). Kimmie, Caroline, & Ashley have all been skating well (and better than Emily) in the GP's, but it's possible that one of them would screw up, and Emily skates great, so she gets bronze.
But if she places 5th or 6th at National's, gets sent to WC anyway due to the age rule, and she regresses farther in her WC standing (8th in '06, 9th in '07, and now with the ever-strong Asian brigade and the rapidly improving Finnish ladies, plus the always competitive Sarah Meier and Carolina Kostner, I think she has very little chance of moving up), I think she will really think twice about continuing her competitive skating career next season. If she really cares about her education as much as she says she does, then she should realize that her future is better served by more focus on her studies, as well as leaving the image of the noble scholar who regretfully left skating than someone who faded against ever growing competition.