I don't think all the cartoonists will get killed. I even don't think one of them will get killed. But I won't lay my hands in fire for that, either.
On the one hand, caricatures about Jesus are very common and most Christians don't complain. Maybe Moslems should learn that we have a freedom of speech.
On the other hand, Christians don't allow to make pictures of God. If someone does, he will be blamed by many Christians. And when we respect that rule, we also have to respect when Moslems don't want pictures of Mohammed.
And the drawings, with the sabre or the bomb as a turban, they are really offending and full of prejudices. So I can understand that Moslems don't want those pictures since only a minority is fundamental and dangerous.