That's a very good point that I have not seen anyone make before. But it's certainly very interesting that it will lead to a lower reward pool.

Since the stake of the @steemit account is not part of the actual circulating supply burning it will not have any direct impact on the price of steem while reducing the marketcap and size of the rewards pool.

While it might not have a direct effect, I believe that a potential burn will give faith to investors who might be skeptical of investing because of the huge stockpile held by Steemit Inc.