So with Arena ending so is the commendation needed to unlock the Legendary Weapons. Right now the plan by Rare is to no longer make these weapons available and instead replace them with new variants. I've never been a huge fan of getting rid of items part of a set you can buy most parts off and the variants just aren't the same as the original. With the Legendary Weapons the requirement to unlock them was pretty ridiculous. You had to complete the Legendary Sea Dog commendation which required 240 wins in Arena. This task was more than daunting. It wasn't simply the fact you need 240 wins which was already a slog, but Arena got to a point where getting a match in general became difficult and most of your time in Arena was just waiting to get a match.
My suggestion is to create an alternate way of getting the Legendary Weapons and instead of creating replacement weapons for the Legendary set, create replacement rewards for completing the Legendary Sea Dog commendation and it's quite obvious what it should be. Just create a Victorious Sea Dog Cutlass, Flintlock and Eye of Reach to go with the existing Blunderbuss. Then there will still be a set of rewards for those of us who unlocked the Legendary Sea Dog commendation to show off, but people will still be able to get the Legendary Weapons and complete the Legendary set.