I'm going to tag Sascot since her son's GI recently wanted to remove meds altogether due to potential risks. I'm certainly not suggesting/encouraging this, just think she may have a different perspective from her GI.
Also, my aunt's treatment was to move from remi/imuran/steroids combo to imuran/steroids only. She was much older than Matt (in her late 50s/early 60s), so this may have played into her GI's decision. Also, she was one of the first patients on remi (in Europe or Portugal), so there may have been less awareness of the risk of antibody formation when discontinuing remi. In any case, her experience was - she had a very, very tough time reaching remission and struggled for, at least, a year or two of severe symptoms (pain, bleeding, malnutrition, etc.). Finally, the combo of imuran, remicade and steroids took her to remission. After a year or two of remission, her GI was concerned about the remi risks and discontinued the remicade. Since then, approx. 20 years, she has been on imuran and a very low dose of steroids (I believe maybe as low as 1mg). This combo has kept her in remission relatively well. I say 'relatively' because she does watch her diet (although does cheat at times) and, if she begins to feel any twinge of symptoms/relapse, she immediately ups her dose of steroids for a week or so. Over the last ~20 years, this has kept her in remission. She has had no other ill effects - no increased occurrence of infections, no unusual signs of osteoporosis (she's mid 70s now, so if she has some osteo now, wouldn't be unheard of for a woman of her age, kwim...)
Again, at Matt's age, not suggesting a lifetime of steroid use is the answer, just sharing what I know of my aunt's treatment.