Miners are being subsidized in these early stages precisely because we want the security of the network to be greater than what would be provided using only the current fee income. This is part of BTC's competitive advantage. While this subsidy exists, the transaction cost should be as close to zero as possible to capture market share from other value transfer and storage systems. Growing now is what allows survival later.

Of course there are limits and dangers, I haven't been convinced that removing the limit entirely is safe or wise. I most identify with Jeff Garzik's approach to this debate (maybe not in bip100's proposed mechanism), and hope we find some common ground.