If Weidman wins it will be good for the sport IMO. It will shake things up bigtime in the middleweight division. Silva will have an all new motivation. We'll get a rematch. Silva will win, then we'll get an epic trilogy.
If Silva wins he'll keep talking about retirement and how he's done everything he needs to do.
In other words, we'll get a better Silva if he loses. #1stepback3stepsforward :-)