I'm not scared, but I think it is worth to look out, because this kind of scenario has already happened, for instance with web-based mail: webmail is convenient, limited, and pervasive. Plus, spam is evil. Result: most ISPs block the outgoing SMTP port without too much complaints.<p>Now, imagine that devices like the iPad are the majority (like Windows is now). Plus, viruses and netbots are evil. Result: Trusted Computing everywhere.<p>This is of course the extreme, very unlikely scenario. However, this is so serious that I think it is worth to watch out, even knowing that the odds are almost nil.