Obviously I'm armchair quarterbacking like every other asshole on the internet. Even if it were warranted by the data, I'm not sure it would make any sense to stop the trial early, since they'll apparently be at their target number within the next few weeks.
I think distribution will be a mess, but the government has already paid for 100,000,000 doses, so I very much hope that (a) Pfizer showed them data to make then confident that 100M could be produced quickly, and (b) that the gov't has been considering a distribution plan. Given the past 9 months of chaos, I have little faith in either of those propositions.
I wonder to what extent the defense production act can be used to make every available company start producing vaccine. Hopefully Trump can be sidelined for the next two months to make sure that he can't be disruptive to the process, whatever it turns out to be.