Our college years are the best years to take risk and learn from the choices and mistakes we make (before heading into the professional level). If you're unsure, it wouldn't hurt to send applications in and experience the interview and selection process. There's an SM book that has an entire chapter on having an interview process and what directors, producers, etc look for when interviewing an SM, since SM's a good percentage of SM job openings require an interview process (and some ask to email them a resume). My interviews for Undergrad School really helped me with going through interviews for Summer Stock at Equity Theatre's.
I've always wanted to go to Grad School (since my freshmen year of high school). I'm hoping to send my app in to URTA before the deadline and a few additional grad schools. If you take a risk during senior yr or after graduation, something is bound to come your way if you take a risk. I think it wouldn't hurt, even if you're not certain.... go for it!!!