I’m sure lawyers are already digging into terms of services contracts and coming up with strategies...and they may be finding the risk of cloud software may outweigh local control after their losses have been realized. May even impact SaaS approaches depending how bad it ends up being.
I read one posting that indicated it may be weeks to fix everything, while other reporting is saying they can reverse it overnight.
Wikipedia claims it must be fixed one computer at a time—obviously a disaster for large scale operations.
I do not have the technical expertise to know if that is true or not.