This may seem overwhelming because we pay attention to the Steem ecosystem as a whole and try to keep up with every development (more or less).

When an entire community which wasn't previously on Steem will join (via SMT or Steem-Engine), they will only care about their community, at least at first, so they definitely won't be overwhelmed (think CTP, if business model doesn't change radically). It should be business as usual for them, plus rewards. Of course, for that we need to be able to onboard entire communities first. And I believe Oracle-D and Steem-Engine team are working to allow that possibility (when there will be a market for claimed accounts, via Steem-Engine).