Yeah, next time something like this happens, and it's convenient to do so, they might as well just call in an airstrike or something, I mean no reason to risk human lives and dead is dead.
I don't think that is what anyone is saying here. They made use of the tools they had at their disposal after five hours of failed negotiations and continued shooting from the suspect. If they had rushed him, he would have gotten his wish of taking out more cops while they took him down. If they waited, he could have slipped away, rushed them in an attempt to kill more of them before his death, or detonated the bombs he claimed to have everywhere.
They didn't want anyone else to die in this guys crusade. They made a choice, and it wasn't a light one.
If you seriously think that cops will now be using airstrikes against bank robbers, I don't know what to tell other than that I strongly disagree.