I'm not really concerned with what a "competent" campaign would do about this. This is a unique election. Bernie is a unique politician. People have been decrying his campaign's incompetence since day one, but he's gotten more accomplished than pretty much anyone thought they would to this point despite their alleged idiocy.
Two points:
Is Trump running a "competent" campaign?
What does a longshot candidate who's currently trailing by ~30% have to lose at this point? What does said candidate have to gain by sheepishly apologizing and rolling over to accept the DNC's punishment which, at a critical time like this, could end up being their official Cause of Death?
What exactly has Bernie done? He's gotten the vote that everyone knew he would, young liberal white dudes. If he was polling better in places that weren't as white as a sugar powdered doughnut you would have an argument, but he isn't.
I would respect Bernie more if he actually attempted to play the game in order to win. I would respect him if the first words out of his mouth weren't "Hi everyone, I'm a democratic socialist", and then wait months to attempt to actually explain what a "democratic socialist" is (and then fail horribly in explaining what it actually is)
I tried to be behind him, I really did. "Maybe he'll explain his very extreme positions, maybe he will be able to convince people". I kept telling myself that.
Then time went on and nothing happened, he just kept saying the same shit that speaks to the same base that we knew would follow him instead of attempting to try and branch out and make a fucking attempt to take a piece of the Hillary pie.
After the first debate I was done, "Oh yea well maybe not a 90% tax rate... but...". WTF Bernie, you can't fucking say shit like that, are you fucking stupid?
He's a fucking joke of a politician, he's right on nearly all the issues (to a degree) but he has zero chops in the political game. That's why I'm pragmatic when it comes to Hillary, because I know that when it comes to policy that has a hope in hell of getting passed she is the best shot, and regardless, her and Bernie stand on the same side of 90% of all the most important current issues.