Rc delegation is one of the most important feature required. Dapps like @splinterlands @leofinance and any more who are onboarding new users to platform require a much efficient and sustainable way to use resources. RC delegation is the key to it. Splinterlands is already delegating bunch of HP to new users so they are able to play game. RC delegation should be preferred in next HF.
I'm not an expert of blockchain or SMT's, so can't say that where they should be. But i think they will enable hive to step ahead. Already we are seeing potential of hive-engine tokens. so if they are more decentralized in terms of SMT, then that's the way forward. and what ever you call them either SMT or HMT it doesn't matter unless that works.