I don't think anybody who is proposing the waiver is doing so lightly or because they don't think there are significant, exceptional circumstances that warrant the waiver. Yes, it is an exceptional measure; these are exceptional times.
I don't think this is really an adequate answer.
Certainly one thing we haven't heard is that the waiver at the WTO would reduce global vaccine supply. We've heard that some people who think that once they have the intellectual property rights they may be able to produce more vaccine may in fact find that there are more complicating factors they hadn't considered, or that they don't have access to other things that are important. This means they may fail to produce more vaccine.
Isn't it better, in this context, that we have as many people trying to produce vaccines as possible and that we take as many barriers to vaccine production off the table as possible? I don't hear anybody saying that granting a waiver of the TRIPS provisions at the WTO risks reducing global vaccine supply.