Today there was an article on CNN about some kind of employee abuse case that referred to attempting arbitration. I couldn't find the article again to link to it but I found a lot more references to it.
The most interesting one seems to be this page from lexology where the summary of a US Supreme Court ruling seems to believe that the court believes that arbitration is something that can fail to resolve an issue. A "stay of trial proceedings until they have had a chance to attempt arbitration" doesn't seem to read as though they expect it to work reliably.
The court can't really be talking about the remote possability that the arbitrators don't take the case, nor the remoter probability of failing to remain an arbitrator long enough to finish it. Mind boggles.