On the ISPs in question, there's a handful of them, when you get right down to it, that provide these services across the country. They are large corporations; they are reputable corporate citizens.
It seems to me that it's a bit of a slippery slope on the privacy side if you start suggesting that organizations should give up personal information to law enforcement in some of these circumstances where it would be entirely possible to get a warrant.
Speaking for the Office of the Privacy Commissioner, I would not advocate such a change.