"Some argue that larger blocks may threaten the decentralized nature of Bitcoin by increasing the resources required by miners, and therefore biasing rewards toward larger mining operations."
That is only a small part of the opposition to larger blocks. A more important factor is the cost of running a full node.
http://www.truthcoin.info/blog/measurin ... alization/
Also, it is not true that the network which "holds miner consensus" will win. A network could win with, for example, 30% of the hashrate, if the exchange rate of the coin with 70% hashrate crashes. Miners would then switch to the 30%, allowing it to win. However, the miner's choice is dictated by the users', not the other way around.