Certainly the law firm that is filing this has taken a lot into account but it is not as easy as people think and they may lose. Look at in the US the Berry case that was won by Watchtower, even though the law firm that took on the case did all of their homework and thought that they had a real case.
I found this interesting about class action cases in Canada.
Tests for Certification
The details of the tests differ in each jurisdiction’s legislation. However, generally speaking, there are five criteria that must be satisfied in order for the action to be certified:
• the pleadings must disclose a cause of action;
• there must be an identifiable class;
• the proposed representative must be appropriate;
• there must be common issues; and
• the class action must be the preferable procedure.