I dont think anything possitive will come out of it.
Take a look at any third party website that sells D3 items currently.
Now imagine that inventory drained of all legendaries and set items once BoA is in place.
I see a positive.
Why is anyone looking at 3rd party sites? Explain that to me first cause the logic just isn't there.
If the answer is "it's easier to acquire gear" than A. you are a hypocrite if you've ever denounced the auction house and B. you've used these sites before if it's a big positive to BOA items.
Have y'all ever heard the phrase "don't use it if you don't like it"? Of course, you've experienced the auction house and you all probably raged when someone said that.
Here's the thing: The auction house was Diablo's way of countering 3rd parties. Everyone complained and moaned and it's now gone. And if you never use 3rd party sites, how do they affect you? BOA affects me because I enjoy finding an amazing legendary item and knowing it has value outside of the game I am playing in and can net me something that my character can use.
I am not thinking "OMG I can sell this for XXX on a 3rd party site!" I am thinking "Awesome, this SoJ will net me a Shako's that will complete my set" (d2 references).
Now, you find an items that is elite and amazing and you have three options:
1. Sell it to someone in your game, better pray you aren't playing with strangers, or if you are that they found something in the game worthy of the item you found.
2. Stash it/disenchant it cause you'll never use it
3. Make a new character, which with infinite respecs only requires you to make one of each, and if one doesn't fit your play style too bad cause you have no other options for that item.
I am blown away that anyone supports BOA legendary items. Blown away.