Odds of Hanging On
The gig goes in stints. The first year is usually pretty secure—some get fired at the end, but they have to have really screwed up to be dumped. By the end of year two, almost everyone just leaves to go to grad school. So there's a natural siphon there. By the time you come back after biz school, you'll be almost thirty and more or less know what you want in life.
If you get the job, the presumption is that you know that you have to sell. If your clients love you, you'll last more or less until they carry you out in a box, loafers on. And if you wash out, say, after five years, you'll be more than qualified to be a CFO at a smaller company.