Separation of RC from SP is not a good idea.This will negatively affect the price of steem.I predict that the price of RC delegation will be at least 10 times cheaper than the SP delegation.So it will decrease the amount of money invested in steem.

You are a small user and you wants to write 20 comments per day?

You can lease 100SP for just 1.5-2 steem per month (minnowbooster.net - delegationhub.com/steem/ - blocktrades.us) and you can comment more than 30 times a day.
What's the problem?!
Why should we complicate even more steem blockchain?!