I still like SBD and I think it can be pegged again along with SMT's it will be the basis of our internal arbitrage can be done and make trading within the steem ecosystem with fee-less transactions quite popular.
What you pitch is a very interesting concept I think you will get a lot of resistance from advocates of the system thinking that people would just want to earn and dump which will for sure be the case and abusers could misuse it for short term gains but I don't think it would be all that bad. I think if the system can dynamically/real-time allocate influence as well as interest on your stake I think it could be a cool option.
As for the whole of steem being this way, not so sure, people are quite tied to the system. I'd say this would be more of a forked/side-chain tribe style where those who prefer this method can use it