The idea to make the auto-reinvest part to be paid in STEEM POWER (powering up users) is a really nice one because it would free up a lot of @tipU own SP. Also every day more and more SP has to be used to support it, which "cuts" the amount of SP that could be used to support tokens. Not to mention the standard "deposit" functionality.
On one side it's a good moment to completely redesign those two services, on the other - I always liked the fact, that users can just deposit some SBD/STEEM and get an interest from doing so.
I think that many users use those because they can withdrawn the funds at any moment. Probably I'm gonna make a post about it to ask how the investors would feel about the possible change but something tells me it's a too big shift in how @tipU operates.
Also - because it looks that people would prefer to keep the tokens, what are the cons of lower liquidity? Apart from higher possible price coming from speculation (which is not such a bad thing?).