Pace isn't the be all and end all of a wide player, however if you have the option to take your opponent out of the game by simply bursting past them, like Bale or Robben, then it is a very useful weapon to have in your team. That is, in my opinion, one of the biggest things we lack in attack right now. An explosive attacking player who can get forward quickly. The last player who was really able to do that was Rashford pre injury issues. A player like Bale or Di Maria who can get up the field rapidly would be a huge addition to the attack.