Yes, I do think the model is highly sustainable. Like a lot of things the platform is not perfect right but it couls be suitable to fit a lot of users and while grows in popularity then the currency aspect will grow too. In a lot of aspects we are pioneers and I think this model of social media is going to be the future.
Rewards oriented or the interner of value is a thing not only the future but the present and steemit can offert that to most.
Thank your for your thoughts on the matter and keep steemiting