I, too, hate the Antropov trade. If Burke realizes he doesn't have enough top 6 forwards coming through the system, he'd have been better off keeping Antropov at $3.5M for a few more years.
That said, putting myself in Burke's shoes, MAYBE I can see the rationale.
Antropov is not a bad player, but when Burke take over this team, he also realizes this team was a bottom feeder, that has a losing culture. The team chemistry, the culture in the dressing room ... etc, just wasn't about winning. Players weren't hungry enough for the W's. Wins are nice, but it isn't the end of the world if we lose. Players weren't willing to sacrifice or execute the little details or spend the extra time at the gym or practice to make this team a winner.
And that, despite what stats the players put up on paper, has gotta change. I am not saying Antropov was a 'cancer', but you gotta admit Antropov and Poni were in a lot of ways, pretty loosey-goosey guys. If you got a team full of Gary Roberts, Ed Belfours, and Wendel Clarks, maybe they can be decent complimentary pieces. But if you are going to change the culture of the team, and Burke doesn't think Antropov, as a veteran on this team now, brings the right attitude and ethics to the team, then that's his reason for parting with Antropov, regardless of what return he gets in return.
Same for Poni. And same reason why he chose to part with Hagman, Blake, Vesa. It's not just about what you can do on the ice, but it's also about the character, the identity and the culture of this team which he was trying to rebuild.