Why forge? To get fees, but when u're forging, u're securing system. Way to get fees w/o securing not so easy to pick (u need modified code, and have that code updated), so greedy forgers'll exist and'll non-directly serve their key purpose (as miners today).
If you read the original post of the thread, the suggestion was to reduce fees to a minimum level required to prevent spamming the network, and remove the financial incentive to mine purely for fees.
I did that. An I'm counterargumenting such goal.
Forgers'es greed'll lead us to perfectly secured network. Almost each one security business I can think about requires competition instead of coopertaion to achieve trustless situation: where every player is not just not expected to trust any other, but don't trust everyone by default. And "green" competition obviously beats down "blackholed" one.