From what I understand, only digital sales have been halted until Tuesday. You should still be able to pick up a physical copy and play, assuming you can actually log into a server.
However, if you played 1.0, you don't have to repurchase the game. You can just download the client from: http://sqex.to/ffxiv_client_en
You'll get access until at least the 9th, although it's looking like that may be extended by a few days due to congestion issues.