CO does have some type of "service recovery" pack -- they handed them out to everyone on a LAS-EWR flight last year that was delayed several hours due to a mechanical. I don't remember what they called it, but I do remember it had a $100 voucher for future travel and a phone card, and maybe some other things. Actually I don't remember if the voucher was for a flat $100 or the "tiered" $25-$100 off depending on ticket price. One was in the pack, and one was mailed to me after the fact with an apology for the delay. In either event, I don't think this is enough for a downgraded passenger kicked out of his/her seat, but the infrastructure is in place.