There may be some thinning, but don't take my word for it. Wait a bit longer and reevaluate. You are still a NW1. If you experience more thinning just hop on the big 3 and you'll be probably fine for life.

Why not minox and propecia? You could try a hair transplant if that's an option. Otherwise there is not much else you can do. Shave your head.

Yes you could. But you are young, I'm not so sure propecia is advisable at your age.

You look like a NW2