I have never commuted for Skywest in Denver, but I have flown non-rev on United and Skywest constantly (30/40 times a year) for the last 5 years, and I have almost never had a problem getting on flights. There's just too much service, too many connections, plently of seats.

Commuting to Denver will not be a problem! Commuting from anywhere specific? I can try to give you some more specific insight.