It might look that way but it would be a logical fallacy because there's no guarantee that Malthouse would win a third premiership in a row. In fact, historically, it's very hard to do a three-peat. If they don't win a third flag (assuming they actually win a 2nd this year), it could be just as much due to the players being less hungry or being complacent. That could easily happen under Malthouse too - he's not the messiah, you know. He's a damn good coach, but we shouldn't be assuming that he can perform miracles. Buckley's performance needs to be judged on various factors, not just comparison with Malthouse. The Pies will have to come down at some stage.
... or a new man in charge may shake things up enough to prevent complacency. Look what's happened at Geelong this year. After a few years at the top (plus with many top-age players), the pundits generally predicted the Cats would fall back to the pack this year. A new coach and they are purring again!