Stable token
I'm somewhat neutral regarding SBD. I do see its potential, but I wouldn't mind if it were to be removed.
Also, I'm wondering whether this would result in a huge pump and a mutation of a "stable coin" to a value storage, as removing SBD inflation, would craft a deflationary currency. (conversion from SBD to STEEM has to be supported)
Power token
My main pain-point with Steempower, is the underlying VESTS currency. It creates accounting overhead (powerdown/powerup is a conversion of currency = STEEM <> VESTS), which is absolutely unnecessary.
The basic idea with VESTS, if I'm correct, was it, to have a currency similar to how a startup's vesting shares. This also explains the previous 2 year lockup period.
Ever since the reduction of 2 years to 13 weeks, it's quite clear that this experiment didn't work out. And now with talks around reducing it even further, or making it dynamic, we should question whether we should keep that logic around.
Liquid token
Looking forward to more comments around this, but I'm intrigued. Having only one token would simplify things a lot, but of course, also create quite a lot of refactoring work and potential bugs.