How would a "waiver" work? Last I understood about law, a country can't take away the rights of companies (or people) without their consent or modifying the patent laws. Or is this a matter where because it has to do with overseas patent protection, the US could decline to enforce certain agreements? And don't companies have patent protection in every country they seek to do business anyway?
Patent laws are also not some natural, inalienable right. They are artificial constructs, provided as a courtesy, because the government feels that in the general case, they are more beneficial than harmful.
In a particular case, they might be more harmful than beneficial.