You mean the World Championships.
The still unannounced World Cup would be NHL sanctioned, probably mandatory (like the ASG), and would probably replace the World Championships on years it occurs. We'll see if they can pull it together.
The NHLPA would have thanks god something to say about that. Making a pre tournament event mandatory in the summer ? Good luck with that what if the newly signed top UFA is getting hurt ? Finland, Russia, Switzerland and Sweden would still sent a pro team the only ones losing are the US And Canada and nobody can honestly tell me, Hockey Canada would accept getting destroyed after back to back golds.
Also I think by the time the next olympics are happening we are going to see a hockeyguy running the show, so yes the players will go