In the long run I think even more powerful than Voting Mana. (Renting RC's is the future in my opinion and will be more profitable than up-voting yourself or voting bots).
Do you know if it will be possible to rent/lease/delegate RC’s independent of Voting Power (mana)? Therefor being able to earn an income stream from unused RC strength but still maintain voting strength.
There are rumours but nothing official. If true then for SP holders this would be amazing news and it would make SP even more powerful.