PDO will soon come back down to Earth, but they're still quite legit. I could see them winning a playoff series this spring.
Depends who they draw, though. Right now, they'd get the Lightning, who seem to at least be figuring things out to some extent, and I'm probably not going to bet against TB (who I foolishly picked to win the Cup in the preseason, but they're not a team anybody would really want to mess around with).
Even Montreal could be a threat in the Atlantic
IF Price comes back in time to save their season. Complete flip from last year, when Price bailed out a team that basically gave up prime scoring chances and didn't dictate the shot attempts, compared to this version that actually does generate more opportunities, yet is let down by shoddy netminding. But that said, I don't like to pick teams to win Cups that aren't anchored by No. 1 centers, and Montreal doesn't exactly have that guy. That's an advantage Florida has with Barkov (great extension for him, by the way: totally reasonable).
Detroit's not easy to beat either. Yeah: that defense isn't particularly great, but there's a lot of talent on that forward group with Datsyuk, Zetterberg, Tatar, Nyquist, and Larkin. Plus, Mrazek has been incredible for them this year (they really should have beat Tampa last year, but failed to put away those opportunities).
I think Florida's "best" chance to win a series comes if they draw one of the Metropolitan Division wild-card teams. They should definitely be favored over New Jersey (though Cory Schneider's capable of stealing a series all by himself: so underrated). If we're talking PDO regression, the Rangers are a prime candidate (their possession numbers are quite bad and have declined so much from that 2014 Cup Finals team), though they've already been hit with regression to an extent and have improved there. But that's a lot better than where a lot of us thought Florida would be before the season (mostly unable to hang with the "great" teams of the East).