Weakest Welterweight Champs ever, who is going to unify?

Is anyone else struggling with the thought of how weak the Welterweight division is at the moment? Historically it has been one of, if not the, most competitive divisions in the sport. How did we get here and can anyone recall when it has ever been weaker?

During normal times we might have one of the current champs be lucky enough to get a belt, but the fact that all four of them have managed it at the same time is crazy. These guys would normally be fringe top 10 fighters.