This got my cruise. We had already mentally cancelled, but I told my wife that this exact thing would likely happen, so we waited to cancel.
We both got an email and text message from them asking us to reply acknowledging we had received it. I assume they are going to start calling people they don't hear back from.
Trying to decide on the 125% FCC or cash. I know they really need the cash, but I have to trust they'll still be a company by the time I want to cruise again if I take the FCC. I like that they will let you change your mind until the end of 2021. Very fair offer and they are obviously hoping everyone defers the refund.