Don't get me wrong, I do understand that you are trying to fight spam and did come up with a solution! As we can see in the comments the steem blockchain has several populations. The whales and Orca, the upper class, the dolphins and minnows, which are the middle class and the red fishes, which are the lower class.
Lots of interaction is going on here, which is good with such an important proposal to the system!
But I did read all the reactions and I think that we can say, that the sentiment is diverse!
I do understand that you are willing to protect investments, but we have to be careful not to disrupt the ecosystem with the change, which I think that could be possible.
Lately I did read a lot of post if we should run our blogs with the heart or like a business, also there the sentiment was mixed!
Your proposal does give me the feeling about running it like a CEO, where you do want to protect the investors more than the employees or customers. I compare it with a company which is making enough profit but want to make more to satisfy the investors even more and therefor firing some people to decrease the costs!
I'm honest that I don't have another solution, but I think that we can agree that no matter whatever solution will be chosen that we will never to eliminate SPAM! Look at all the mailboxes in the world. Lot's of spam prevention has been enforced and still spam rules the mailboxes!
Maybe we should better educate the users so that they won't reward SPAM!
I'm happy to discuss this further with you!