Somebody should manufacture and sell bags of replacement Shift keys. Whenever you come across someone who needs to learn to use one, you could send it to them through postal or interoffice mail, along with a little card explaining its usage.
Just remember... you read it here first. If someone makes money on this, I'm taking half. (I also claim rights to this idea for the F1 key, for people who ask questions that are clearly answered in the first page of help results.)