Great comment, thanks!
SBD is dollar worth of STEEM and removing it is simpler because all SBD could just be converted to STEEM no matter where they are (exchange or savings).
Influence on reward pool, witnesses, dao, all will be similar to what we have now. In post, example number I choose was 30 days, you can call it 13 weeks, which will turn system into current system, but token staying liquid (influence is not).
Interest also stays and rewarded depending on influence or mature token holding.

Savings are great feature we have on Steem, with only one liquid token, Savings could be used as safeguard feature where you can store liquid token on savings with different interest rate (right now SP is used in some ways to safeguard token).