Yes, but that requires some group to agree on this and to run new code, even if it only removes the difficulty bomb. This is not as trivial as you make it out to be, especially because some individuals that may disagree with the 'main' development branch may also still value the difficulty bomb.
It's obvious that this does not prevent disagreement about the protocol, but it greatly affects a fairly large class of disagreements and changes the incentives for a variety of behaviors. It's all game theory, and as such minor changes to the premise of a 'game' can have large impacts on how it plays out.
