Capts might have to do trials for players, but doesn't mean any of them are going make it into the team the capt still gets to choose who passes the trial right? Doesn't seem like the rule does anything.
Teams will still have FULL control on who they accept and decline. It just allows non-"known" players to show and prove whether they are worthy of it. And not really wasting time either, you will have 2-3 months to draft, practice and perfect, this is plenty of time. And as a world cup i feel it wouldn't be right if everyone didn't get equal opportunity. This is exactly what i did last year, allowed EVERYONE to trial, and have equal chance, and was pleasantly surprised by who stood out and who didn't. A trial can be anything from group fighting practices, melee training, Teamwork training to just simply watching them play on a group fighting server. I feel this just makes it fair for everyone. And at the end of the day, its still the captains decisions