There's a member on the Ostomies board who survived a bout of TMC without surgery, but ended up with a colectomy a few years later (same story as NCOT I guess).
"Suspicion of TMC" though doesn't mean surgery is a sure thing or even likely. It's just that TMC is one of the most dangerous situations a UCer can face and it must be investigated promptly if it's suspected at all. So even if your GI thinks you might have, say, a 10% of having TMC, it has to be checked. Now.
dx'ed UC pancolitis 5/12
past meds: asacol hd, VSL#3, apriso, rowasa, xifaxan, 6mp, cortifoam, pentasa, cimzia, canasa, butyrate, flagyl, cipro, prednisone, remicade, methotrexate, cholestyramine, cortenema
current meds: none!
step one: colectomy, end ileo 1/16/13
step two: j-pouch construction, loop ileo 5/1/13
step three: takedown 7/31/13