In terms of ISP's opposing these types of requests, the law hasn't changed. I'm not so sure they'll go after the big ISP's unless they are sure they won't encounter opposition.
If Voltage pulls the same stunt against Rogers and Bell customers and they meet opposition, they will incur significant legal fees if they are tied up in court for an extended period of time. These are copyright trolls we are talking about. Linking a name to an IP so that they can extort money is their business model.
They won't be able to maximize their profits if ISP's do not give them a clear path.