I don't think they should change the requirements for purchase. The pets are a symbol of achievement, it would cheapen the effort if anyone could purchase them prior to being the proper level even if they cannot use it. The pets might not be around forever, if they do retire, its a nice perk for those who put the time in. A similar argument was made around the time the Korrealis Prince/Soverign mounts were going to be retired prior to patch 1.2. Their valor rank to purchase and use was 65. Many people wanted to purchase them to save until they reached the level but the change was never made. I think if thats the direction they said they were going, they should continue on that way, it wouldn't be fair otherwise. Valor 70 takes time, but it can be achieved in two to three months. The system is fine the way it is.