The problem with implementing such a change is that it lumps everyone together. Punishing the newbie / minnow user who are providing good content to the platform because you want to punish spammers. Good content can't always be defined by it's monetary value. If you are a newbie / minnow then for the most part your good content goes unnoticed aside from some other newbies / minnows commenting and upvoting. You can get a dozen upvotes from newbies that like your post and only have 0.05 in rewards. Why should such a comment have it's rewards removed due to wanting to punish spammers ? The answer is that it shouldn't. Newbies and minnows alike depend on these small payouts to grow our account. It's a momentum occasion when we see one of our comments has reached $1.00 in rewards.

Picture Source

If Steemit goes in this direction, for the most part only Dolphins and Whales ( posters with the most influence on steemit ) will be receiving the bulk of the payments. It's hard enough to succeed on steemit as a newbie / minnow if this is introduced it will only get harder. These small payments we receive as newbies is what helps us grow our account.