The questions are:
- Do we want the block size limit to continue to serve its original purpose as an anti-spam measure?
- Or do we want the block size limit to serve a political goal of reducing the cost to run full nodes?
From an economics perspective, I suppose it's a matter of whether the economic loss due to the production quota on block space is outweighed by reduction of some negative externality (a lower ratio of nodes / users, I suppose).
There is more discussion on this here: http://bitco.in/forum/threads/gold-collapsing-bitcoin-up.16/page-12#post-392