Maybe down the road when Steem is bigger, if Siacoin or Storj (or their successors) succeed at undercutting AWS in terms of cloud storage pricing in a way that facilitates hosting of content in addition to offsite backups, we could propose a stakeholder vote to have this blockchain contract directly with a distributed storage chain.

As far as DDoS protection goes, Amazon definitely needs to step up their game, considering they are still playing catch-up relative to the big names in the industry.