While JJ must be held accountable for this poor effort, I don't think he's the problem. Had Eckert coached Team USA and JJ coached Team Europe, it still would have been 11-3. A general whose soldiers are poorly trained will not often fare well in battle.
Perhaps I expect too much of a coach., but when a Mosconi Cup coach holds the post year after year, they have the opportunity to get in the faces of the players and demand that they work on areas in which they have underperformed. There is no evidence that this is being done and players seem to have the same weaknesses year after year.
My guess is that MR will stick with JJ, provided that he wants the post. Of those who have yet to coach a Team USA, I'd like to see Mike Sigel, Allen Hopkins or Kim Davenport as coach. I suspect, however, that MR would go younger, but at this point, I'll pass on anyone who hasn't represented Team USA multiple times.