By AAS, I assume you are in an accredited MA Associate Degree program.
Medical Assisting is basically a vital but entry level patient care position in a clinic. The good things are that you work with patients, your job is not going to kill anyone, you tend to work office hours, and that the field is growing. The bad things are that it's fairly low paying, you may be stressed, you will see some gross things, and not everyone gets a great doc to work for. It's a short diploma program (1 year or less) and if you get an AA, you may be able to use those extra credits for other majors.
I do understand doing the MA AD program if you want to become a nurse. If you do your GE right, it can count as GE when you get your BSN. You are also getting patient care experience and medical office experience.
However, none of this will help you to become a PA or an MD. If these are your goals, then you need to be focused PreMed/PrePA (they are usually about the same thing) and getting into med school/PA school. There's *no* reason to be messing around with degrees that aren't going to help you and that will require you to go back to school to redo the proper PreMed coursework.
If you continue with the MA/BSN programs, you will be wasting at least 3 years of your life (1 year MA, 2 years BSN) in programs that are not going to help you become an MD or PA.
"Maybe someday a physician," isn't realistic. MD/DO/DPM is 4 years of undergrad classwork, 4 years med school, and 3-10 years in residency. You don't become a PA and then get promoted to MD. If this is where you want to end up, it's time to get going on it. You need to be extremely good at school and set on this path.
If you want to be an RN, then yes, get your BSN and then consider moving on to NP (Nurse Practitioner). You'll practice for at least a year and then go to NP school, which is usually a 2-3 year program.
Good Luck.