You can still download P.T. if you already purchased it
The fact that so many people will miss out on P.T. is still tremendously sad, but there's a silver lining: according to Polygon, if you already "purchased" P.T. before it was taken down, you can still re-download it. Thank goodness.
This comes as a relief to me because, as someone who doesn't yet own a PlayStation 4, I quickly added P.T. to my account via the PSN website. Good to know my efforts weren't in vain.