I heard there might be some type of RC pool that would allow the leasing of RC...I am not sure about that though.
The referral system sounds like a great idea. It might be good to elaborate on it some more...there is a way to write smart contracts on this blockchain now. I am not sure how it would tie into SP though.
Saw the idea for RC delegations being floated by @therealwolf. Sounded like another vote buying scheme to me.