I think you are missing the point of the five vote limit before reducing the power. Look at this theoretical example.

There is a total daily reward pool of $5000 SBD
@ned votes at 100% power 40 times each vote uses up 100 dollars leaving $1000 dollars...ever other vote would only be worth $1000 total.

The goal is to actually make the first 5 votes or real active user worth a lot more then they are now. The value of our votes come out of a pool of SBD based on sp. The more sp the more you can pull from the pool, by changing the power reduction rate more money will be left in the pool for lower sp users.

The goal of this move is to decrease the impact top users have on the pool. While still allowing them to greatly impact the value of 5 post.

I actually think its an amazing way to spread the power around.