You know my siblings and I joke that our parents were probably the last two people on the planet who should of reproduced. Why, because on both sides there weren't good genetic markers. Our father had RA and our mother had diabetes, just to name a few of the health conditions that are in the family genetics. However, are we serious about this do we regret them having us? Of course not, first of all they were great parents, and they gave us life.
Also, even if you do happen to pass RA on to a child, there are new advancements coming out all the time. I and my siblings know that if any of us should be diagnosed with RA (which we haven't yet) that it won't be a debilitating for us as it was for our father. Because there have already been major advancements made in treatments for the condition. Who knows what the future will hold.