If sbd could only be accessed through steem, held/traded internally, then it creates a reason to buy steem, to get to the stable coin, or back to another coin.
Letting sbd float negates a reason to buy volatile steem.
Why buy steem when you can get a stable steem, sbd, instead?
To be king of the social scene here?
Misfits, outcasts, pirates, and the underprivileged rarely celebrate kings.
We get enough proof of wallet at work.

Could yield all content rewards to curation.

I came onboard after curation went to 25% from 50%, so I dont know first hand how that would look, but I do know how much i liked my vote doubling during the whale experiment, and again with the hardfork.
If <50 people have to be restricted, by others voting their stake, a 'valid' community response, to make steem attractive to what will become the middle class, I wouldn't kill adoption by forcing proof of wallet on 60k users, without a good reason, and I was wondering what the reasoning was.

Proof of wallet is an age old feature of the current paradigm, it's time to shift that feature to something more favorable to the masses, proof of brain.
The n2 could do that, if not abused by the distribution.
(I do understand why distribution had to happen that way, but it has long been time to take that control out of the mix until a threat forces steem's hand.)

The best interests of the masses lies not in the rich getting richer, but in monkeywrenching the machines that keep them poor.

Keep working, stop paying.
Quickest short circuit of this bankster dystopia you'll ever be exposed to, and available on any given Tuesday.

While i got you, 15m sbd isnt near enough to compete with the trillions of any other currency, how about the chain sells sbd for 1usd of steem?
The steem derived could be burned, used for development, returned to the pool to augment/replace normal inflation, or whatever proportions witnesses decide.
I vote for the latter.
A simple bot account could handle the exchange using an average of X day's prices to lessen abusive manipulation.
Using an account opens monitoring to everybody, not just folks that can pull data.