Yes, look at the stake @ned and @steemit have. But @ned is doing a lot of delegation too...

Regarding SMT that's a Steemit thing. BitShares already has something like SMT's and I'm not sure why @ned or Steemit is trying to reinvent the wheel? However it seems they do have more options. Check their whitepaper.

EOS is just going to be an Operating System for dApps (decentralized apps) so it hasn't got a particular use case like Steem or BitShares.