Once you go under 2 meters of intestines you face Short gut syndrome. If you have enough left over after surgery you might be ok. Sometimes the reward outs the risk. I was this way when I said I was getting the BCIR since I have FAP and the nurse at MD Anderson threw the book at me about this very subject. I risk losing more small intestine but I wasn't going to live with a bag. It was death I told them or the continent ileo. Hell I even had it in paper on my surgical release, no permanent ostomy was to be done if my mucosa wasn't long enough to make the pouch and leave colon in tact and I was going to find plan b,c,d,e....
So ask about SGS and see if you have enough bowel. Even if you do get SGS there are ways to medically treat it so it has a bandaid on it basically, but there is no cure for it.