I presume you mean IBD, since they don't give Rmicade for IBS. Failure of one biologic does not mean he will fail all biologics, but he certainly cannot stay on prednisone indefinitely. The longer he is on it, the greater he risk of serious, irreversible, long term complications. Each other drug, biologic or immune modulator, can take up to 3 months before being fully effective.
He can have the colectomy, retain his rectum for future j-pouch surgery, and get more time to figure out the diagnosis.
But, I am also confused as to whether he has had surgery yet or not, as the posts are conflicting.
Jan