I'll just note that this bill does not actually eliminate the concept of use. It eliminates the administrative requirement that trademark applicants have to include in their paperwork a statement indicating that they have used their trademark in Canada. So use is still in the system.
For example, applicants still have to show use or propose to use in order to apply for protection in Canada. It's the sole grounds. Applications can also be opposed by third parties on the grounds that the applicant did not use or intend to use the trademark, so it's still grounds to oppose a trademark. If use can't be substantiated, then the trademark cannot proceed.
Consistent with current practice, registered and third parties have the ability to challenge a business for non-use of a trademark before the Trade-marks Opposition Board, so use is still at the core of the trademark system.