I think the most important thing to remember is that healing is a long process, especially healing from such an invasive procedure. It's going to take quite a bit of time before he feels like himself again. I think this is the main factor that makes me unfomfortable with surgery, but in reality, most people who have surgery end up having ZERO regrets.
You will get a better response on the ostomy board: https://www.healingwell.com/community/default.aspx?f=33