Looks like certain parts of the world are coming to their senses. Amazon.com no longer publish a '-all' SPF record; instead they've reverted to '~all' which doesn't ask people to throw away forwarded mail, and which of course renders SPF useless for its most commonly stated purpose.
Hopefully Amazon will roll out one of the various alternative anti-forgery schemes which doesn't have such significant problems, rather than just being discouraged by the whole thing and leaving it as it is. The brokenness of SPF has potential to be actively detrimental to the fight against spam, because people are being tricked into implementing it without fully understanding the consequences of the way that SPF tries to simplify the way that email works. Those people could be put off trying other, saner, schemes.