One informed source said it was greater than a 50-50 chance that the crew would come back on Dragon. Another source said it was significantly more likely than not they would. To be clear, NASA has not made a final decision. This probably will not happen until at least next week. It is likely that Jim Free, NASA’s associate administrator, will make the call.
Asked if it was now more likely than not that Starliner’s crew would return on Dragon, NASA spokesperson Josh Finch told Ars on Thursday evening, " NASA is evaluating all options for the return of agency astronauts Butch Wilmore and Suni Williams from the International Space Station as safely as possible. No decisions have been made and the agency will continue to provide updates on its planning."
I thought I’d seen something about it, I guess for Dream Chaser, but a quick look at Wikipedia the only reference I see for a human-rated Vulcan is a tweet from ULA CEO Tory Bruno in 2016 saying they intend to human-rate it. Of course, back then I think we all expected Starliner to be wildly successful beyond the base NASA mission requirements.