Except that miners have zero incentive to destroy the bitcoin network. Its like cutting off your own head.
Which is why I wonder why any miners want to mine at a pool which mines very small blocks, intentionally delaying thousands of perfectly valid transactions by keeping them out of every block they mine. Just compare the sizes of Ghash.io blocks with blocks from Bitcoin friendly pools. Miners must be blind. If it isn't intentional, it must be due to gross incompetence.
I wonder why the Ghash.io is trying so hard to destroy bitcoin. They haven't done anything to reduce the size of the pool, and keep mining microblocks. When one pool operator which already is known to deny most transactions gets to decide for themselves which transactions will go into blocks and not, Bitcoin have lost one of its most important properties. Instead of being a distributed currency, it is a currency controlled by one malicious pool.