Too bad that the CDL, out of all concerts, had to get cancelled... Yea, they could do it at a later date but I think the countdown is an important factor of the show. It really adds to the hype, so it's incredibly unfortunate that they had to cancel it.
If they want to hold it at a later date, then I assume it's going to be relatively soon (assuming nobody else is sick) because I think there will be a few months where Ayu can't perform due to pregnancy/giving birth. Unless she wants to do a PL 2.0 (which I loved but she was very exhausted afterwards).
I hope that nobody else got infected. Especially since Ayu is pregnant... Even if she were to have a 'light' version of the virus, it would definitely take its toll on her health. Pregnancy is already a lot to deal with for one's body...