Take it from a senior at ERAU NROTC - and really hoping to pick up SNA soon. Major in the subject which you are most interested. Do NOT, try to please the Navy with a tech major or anything else, unless that is what you want to do anyway. You will best serve the Navy and yourself by majoring in your area of interest, as that is where you will excel the most. As far as Aerospace Studies is concerned, it gives no advantages in service selection. Tech majors, i.e. engineering, physics, etc. are the only fields that offer any kind of leg-up, but even then, they aren't a substitute for good grades.
As of right now, some prior flight experience can help as you progress into flight school (after commisioning) as I understand, but plays only a minor role in selecting aviation. The reasoning is that the Navy will teach you to fly as they intend. It is for this reason that they are considering no longer paying for the flight hours of scholarship Middies. Despite much talk, they still have yet to implement such a policy. Personally, I would love to be flying right now, even if it were just a Cessna.
Hope that helps. If you have anymore questions about Embry-Riddle or the NROTC unit, feel free to ask.