CO OnePass is declining for sure, but can you name a better program??? I think not!!!
B767-200ER,
You would be making a good decision by switiching over to OnePass. If IAH is your home airport then you have CO's ever expanding route network and largest hub at your fingertips (or does CO have YOU at their mercy???), versus some US connections via CLT, PIT, or PHL, which really aren't that convenient when you have to head out west.
Welcome to the OnePass Brotherhood (and Sisterhood.)