I think that there needs to be some thought on how to bring more "value" to steem and sbd. You either want to have people investing equal to the amount cashing out or convince people not to cast out because they can do more with steem than with a local currency.
One possibility (that most social media apps already do) is to ad advertisements. You could make them only purchasable by Steem. This would cause companies to purchase the Steem with some other sort of currency. This investment into steem would hopefully counteract users who are cashing out. I would hope that the Steem used to purcahse the ads would then be spread out to steemians who choose to have the ads displayed on their posts.
Another option would be to create a Steem Market place where vendors could sell items for Steem. Your steem has value in the community so you may not cash out. The one risk here is that the venders could then just cash out.
I also have stumbled upon #steemgigs where steemians can post freelance work and can be paid in SBD. Again, this brings value to steem as you can use it as payment rather than cash out. To bring more value the hope is that people would transfer currency into steem to pay and that the payees keep the steem in steemit rather then cashing it out.
Darryl @dadview
The promotions tab is supposed to help, but few use it, unfortunately. You burn SBD to promote a post which, in theory decreases supply of SBD which should increase value of existing SBD. I'm still hoping <a href='https://steemit.com/steem/@dan/steemit-s-evil-plan-for-cryptocurrency-world-domination">this plan for world domination will still happen at some point in the future. That was one thing I was the most excited about when I first joined Steemit. I was sad to see Dan leave the team because of this vision, and I don't want it to die.
But yes, I think posts from the promotion tab sprinkled within existing feed content would be a nice way to go. It could even start as a setting people could opt out of if they didn't want it (but default it on to begin with). My hunch is, the promotion content would become more important overnight if that happened.
Just got a chance to read his post about a steemit marketplace. I agree.
This would be a great step in the right direction. As stated before, we wouldn't want the merchants to then go and cash out as well. Hopefully if people are buying with SBD, they will then reinvest to continue to have more in their account.
It would be great if the merchants had to pay a fee in steem or could pay for advertising similar to how you state the promotions tab works.