RTD could get involved and if they ran the “coach style” buses like we used to take to DIA and if the price & times were decent people would be more inclined to use them. But the 1 time I took a bus (crappy in town bus) from Lakewood to Breck it actually dropped us in Frisco and we had to grab the local bus up to Breck. The return times were early too. All in all we were able to ski about 4 hrs once we got the bus connections. Combined with the price it just wasn’t worth it (circa 04-05).
But if I was able to get a bus reservation and had time choices I would be more apt to try it again. Lots of us that commuted in Denver took buses or light rail to-from work, many of our workplaces gave us free passes. It worked great and while it took slightly longer than driving it was definitely more relaxed. I enjoyed being able to kick back and listen to music or just zone out and people watch.
CDOT runs the Bustang. I have no idea how successful it is. https://ridebustang.com/