At the end of the day, at least medium term for the next 5 years or so, it's probably best if Starliner succeeds. I hope Boeing takes the financial hit and flies another certification mission, then some of their 6 operational missions.
My understanding of Commercial LEO Destinations is that NASA will just buy seats and station time, letting the new station operators figure out booking flights. I want to live in the future where a station sees a mix of Dragon, Starliner, Blue capsules, Gaganyaan, Nyx, Dreamchaser, Rocket Lab capsules, Shenzhou, and Starship.