I've been seeing a few answers in the Live Design AMA to the effect of "Blizzard should hire pro players so that they can tell them how to balance". I think a lot of people forget that the skillset is quite often not very transferable.
Almost all pro players are so good because of their mechanics, but that skill doesn't transfer at all. A lot of pro players have a great understanding of how to abuse advantages, but again that's not a skill that transfers. Even fewer pro players understand how the meta works, and here's where the skill finally transfers. Those players also need to be team players, articulate themselves well, be from North America or have a convenient way to move there, be problem solvers, and hardest of all be able to come up with solid ideas.
It's a tough skillset, and while I agree that pro players have a lot more to offer than they currently do in terms of consulting, its not as clean cut as it would initially seem.
Pro Players as Balance Designers
From Bakery's Blog on 03/16/2017