Such inspiring replies!
Just recently got diagnosed with AS as well and i ask those questions to myself everyday. My gf has fibro and with my situation sometimes marriage can be questioning but i guess the idea here is to not let AS control your life.
Like someone mentioned above, health is such a fragile thing. People with no health problems can turn out to have very bad problems within a matter for few months. So you never know what life brings.
Put AS out of the equation and make that decision based on your heart just like everyone else. Do sit down and lay it all out with the Ms. tho.
In my case it's a little easier since she has fibromyelgia and she is very supportive of my situation and she even says we will do everything we can to live our life without these disorders stopping us from it.