I had my j pouch removed and a BCIR constructed.  Although a short segment of intestine was used to construct the new pouch, I have no signs of short bowel syndrome and now I watch my food intake to maintain a stable and healthy weight.  A significant percentage of people who opt for a BCIR or k pouch have converted from a failed j pouch and have had very positive results.  I would suggest that you get a second opinion on your condition.

I was somewhat concerned about this because during pouch formation, due to complications, I lost  much more than the usual amount of small bowel. I wanted to maintain the max amount of intestine, as we all should.  I had UC but this would be even more important with Crohns. When I asked the surgeon how he was going to do the disconnect /removal I would have lost more bowel, not just the pouch.  Don't assume they will just disconnect the bowel at the pouch and stick the disconnected end through the abdomen to create a stoma. It can be much easier to disconnect the bowel near where the stoma is being formed (how he intended to do the surgery) and then remove the pouch with a "tail" of small bowel also removed. I insisted and he agreed to not do it that way but to preserve as much of the small bowel as possible.  I have had no issues with short bowel syndrome. That plus a well-formed stoma that sticks out 3/4" or so above the skin has made life with an ileostomy very simple.