So the blockchain of your vision is going to run very similar content-voting-and-rewards systems on multiple levels of abstraction? That seems anathema to the efficiency-and-scaling doctrine. 

Once you've built new voting systems and dropped dApps into their SMT walled gardens, I think it's going to be way too tempting to drop first-layer content voting and rewards and just have the core blockchain support content storage and SMT operation, while all the rest is done per-dApp on the SMT layer, in the name of chain efficiency. And it's probably the right thing to do from a system design standpoint. 

It kind of calls into question why starting from Steem is a good idea, though.