The difficulty is when there is a power asymmetry in the original agreement, as there normally is when it's an individual signing a contract with a larger organization.
Two large companies agreed to arbitration? Stick to the original agreement, as both sides paid lawyers to advise them on what to do, and there was almost certainly a negotiation. But individuals don't, usually, have the resources to hire lawyers or the ability to do the kinds of negotiations required to get favorable contracts. In such situations, I am troubled that we can end up signing away our ability to appeal to the courts to intervene on our behalf.
If this issue gets enough press for a long enough time, I could see legislation that voids arbitration clauses in certain cases.