Mike's core concern, based on the thread on the Foundation forums, is that Cryptolocker is a serious problem, and because it's such a demonically simple way to extort cash from people, it's going to become a huge problem. There will be many, many copycats soon, and you get enough non-techies getting ripped off and having their first experience with bitcoin this way, and suddenly govs around the world become very hostile to bitcoin (vs barely caring about it, and figuring out how they feel about it as is the case now). And then (or perhaps before), you can kiss any hope of business acceptance of bitcoin (something we all dream of, I'd imagine, so that we can transact in bitcoin without having to resort to exchanges) goodbye.
Here's a thought - why don't people keep their virus definition files up to date? Microsoft deserves a huge amount of blame for leaving their OSes unprotected for such an incredibly long time, but windows 8 actually does include Microsoft Security Essentials for free.
Anyway, how many people have actually gotten the cryptlocker virus? I think it's pretty unlikely that this will be anything more then a fringe thing affecting people who probably don't have any valuable files anyway, because they don't even know how to use their computer. A virus writer will have to be extremely selective in targeting people if they don't want their virus to end up in virus definition, which in turn means not very many people will be effected. If they try to spread it all over the place it'll end up blocked everywhere, which in turn, again, means no one gets it.
I had a friend call me and tell the story of a small company (20 PCs) catching cryptolocker and needing bitcoin from him. It
is a problem and it
could become big. Unfortunately it also is a problem for Bitcoin (by association). The answer to this threat however, does certainly not lie in trying to render Bitcoin payment less attractive for those criminals. It lies in
tightening your security and making regular backups... which you should do anyway.
The reason why Cryptlocker is putting people in misery is not too much Bitcoin, but too little, and too late, Bitcoin should have been invented right at the beginning of the internet.
Cryptlocker relies on some command and control servers on the botnet to send it the public key, the reason botnet exists? It doesn't cost any energy to send spam E-mails, which is exactly how Cryptlocker spreads. Bitcoin, created to thwart the botnet, shows how useful hashcash is, and how irresponsible the E-mail providers are. Responding to ransomware threat by proposing to regulate Bitcoin is another step towards the wrong direction.
And we should really regulate RSA, really really should do that, Ransomware will be useless without it.