This should be a wake up call to established space players: the days of cost-plus contracts, multiple bid winners, and endless cost and time overruns - are over. There’s no purpose to those anymore.
For the past fifty years this all made sense: going to space was hard, and the financial risks were astronomical. This decision highlights how much progress we’ve made toward establishing a “space economy”. Space has been de-risked enough that the corporations can take on the (previously fatal) risk of a fixed-price contract. De-risked enough that the government is reasonably certain of achieving a strategic objective with a single provider.
BO, ULA, et. al - the game just changed. Adapt, or die.