https://gist.github.com/gavinandresen/5044482I am not sure the numbers are sound (I think the underlying study that Gavin relied on has some pretty worst case assumptions) but even assuming they are 10x actual cost the idea that there is no cost is simply not supported. A 1 satoshi fee (or even 100 satoshi fee) for all intents and purposes is a no fee transaction.
Let me go with his assumptions implying a rational minimum fee of 0.0008 BTC for a 250 Byte transaction.
That would imply a total fee of 3.2 for 1 MB blocks. We have not even seen that magnitude yet (exceptions were only fucked up transactions).
Means we are not even close to block size limit sqeezing out meaningful fees, so why increase it?