Do at your own risk never works lol.
Take a look at the current trade system, There's notice's left right and center exemplifying about the risks of scamming.
But Oh nooo, everyday someone is getting scammed.
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I would suggest that you and your friend both create a new account and add the shared account as a friend and always login the noob account first to see if your shared account is online. This would prevent kicking each other off.
When u share acc and the guy know ur Email/Gmail Can tell anyone and spam your Inbox ?
I don't mind account sharing until players complain that they got hacked. You shared your account, your fault.
Poor OP his thread got completely thrown out of topic, and every time someone points it out they just continue to post off topic material.
To answer your question and give my thoughts on it, I do not see this idea happening any time soon if ever. The main reason being that account sharing is frowned upon, it's sort of a gray line kind of case where you can do it but its at your own risk.
That being said, I highly doubt that staff and even snk would approve something that promotes an idea they advise against.
I think account sharing should be legal. Players are responsible for their accounts, and really they should have to freedom to choose whether or not they want to share their accounts.