Don't see steemit inc selling more then they already do which is around 800,000 coins per month from what I read today. They cut overhead, reduced costs for servers, and added a revenue stream with ads. They are running lean and mean with a real income stream. If they are smart they cut selling to as little as possible allowing the price to rise creating some FOMO getting others to buy in more which will rise the price further. Then start selling again, but less each month then before raising the same amount of cash to build up their reserves.
And yes less SP voting will increase the rewards for everyone.
Need to reread the code on the inflation rate, can't remember if the rate is applied on the total steem in circulation spread over the SP, or only applied to the powered up SP. Either way it's a good thing for the masses. Either less steem will be printed each month or the same amount will and more will go to those who are powered up.