Calgary wouldn't, they have no need as their back-up is Reto Berra. Edmonton wouldn't, they're clearly testing out Ben Scrivens as their goaltender of the future and have a veteran back-up they're paying $2 million to. The Islanders might, but there's never an explanation to their madness.
Regardless, I don't see Zatkoff being waived this season and my statement was meant to apply for the beginning of next season. I expect the Penguins to roll with three goalies once Vokoun comes back as we need a safety net just in case Vokoun is unable to play/play at a high level.
If the Penguins lose him on waivers in September/early October...whatever. Zatkoff isn't a good goalie, he's a cheap back-up who's played a sheltered schedule (3 starts against teams currently in the playoffs as of today; the best of which being Minnesota...oh, and the Penguins score an average of 4.25 goals per game in games he plays in, never scoring fewer than 3). Honestly there's a good part of me that would be happy to see him snagged off waivers, I don't see any upside to him. He's a fringe guy with a history of post-season failure. Meh. If he's placed on waivers that means we have a veteran back-up who's almost assuredly better.