Two days later and still haven't heard a rational explanation as to why Bylsma was retained and Shero got tossed. So, I've tried to list out a few possibilities
"We really weren't kidding" theory - Maybe they ARE going to keep him on, particularly if you believe the tripe the Mario was doling out that "Dan is a good coach, he'd have a job tomorrow, blah, blah, blah...". I'd say there might be some merit to this one, knowing the Pens and particularly if the let a know-nothing like Morehouse run the show. But good coaches get fired all the time, and there are very few of them that don't get another job relatively soon. What's the point of keeping him on - the only way this works is if he wins the Cup next year - another playoff flame-out and you've wasted yet another year
The Sacrificial Lamb theory - Pens start slowly or have a poor regular season, and the new GM has someone he can fire. This might be the most logical one, but again, you're wasting another year of the Crosby/Malkin window
The Pirate theory - Maybe the Pens get tired of the Pirates hogging the sports narrative with their idiotic front office/ownership foibles, and decide to do a few of their own to stay more relevant. You have to admit, they've already topped the Pirates unwarranted contract extensions and fan alienation with this move
The "he's so good we can't let anyone else have him" theory - keep Bylsma so that Wash/Fla/Car/Van can't hire him the next day. Play a game of chicken so that these teams won't wait, and will hire another coach before DB is available (particularly Washington). Leave other teams in limbo by putting your team in more serious limbo - truly Pens style
The "Hoosiers" theory - they were going to fire him, but like with the Jimmy Chitwood character in Hoosiers, Sid comes in and says "It's time for me to start playing. One thing though - I play, coach stays - he goes, I go" . On second thought, this might not be too likely.
The Sid punishment theory - Mario teaches Sid a lesson about running off the coach. Just like the master did it, you don't tank out and whine in the playoffs - you do it during the regular season.
The drunken monkey theory - The front office decided to make the decision by giving a drunken monkey a handful of darts, throwing them at a wheel with different scenarios. First dart hit "Fire Shero". The monkey then passed out before he could throw any more darts.
Any other thoughts?