The problem I have with the idea of "DM is Boss" is the presumption that the DM is always right. After all, if the DM always has final say, then, no matter what, he or she gets to define what is right.
Now that interesting. When we started 4e, we started as more mature gamers. We have been at it a while and have an understanding of what works. With that in mind, we had a couple of get togethers to get organised before play even started. During one of these, I spoke to my players and said the following
"I am going to do my best to create an entertaining and fair experience for everyone, but Im not always going to get it right, and Im certainly not going to make decisions you agree with every time. With this in mind I ask the following of you as players. If I do something you disagree with, tell me and I will consider what you have to say. If however I am un-swayed by what I have to say, then you have to accept my decision and agree to take the discussion off-line"
(It was something like that, but that was the ethos of authority I clung to as a DM)
Bascially, DM's ARENT going to get it right every time. There human with alot more to track than the players do. Right or wrong, if they are constantly second guessed during play time then there is no game.
I agree with the players right to raise concerns during playtime, but there has to be a point where the buck stops with the DM, and its up to the player to understand this as well. As much as we pressure DM's to be good and not say "Because I said so" there is the other side which is for players to be good and understand that sometimes they need to accept the DM's decision and move on.
This is why I have the stipulation for players to approach me outside of play. Quite often they did and expressed that they didnt like my decisions, but this I use for helping me mould my method for the next session, not to get bogged down in the current.
I guess this is why Im not to fond of the original post. Yes, it sux when a DM sais "cause I said so", but its a two way street and players can be bad "game citizens" as readily as a DM can.