Missing info from the article.
No, the field notice says not only that you can proactively replace, but they recommend that you do. Obviously you then have to keep your fingers crossed that the current one doesn't fail until it arrives.
Also if your current one does fail, I'm sure shouting at them to get the import stuff done quicker might help. If the only issue is money and taxes then Cisco can eat that cost as well.
I can't imagine replacing all customer units is going to be cheap. The units they get back can't be resold as new.