That must be the most retarded statement I have seen in a while...
Securing the network has nothing to do with ASICs. Regardless of the size of the network, what matters is how the hashpower is distributed over the nodes. A 500MH network can very well be much more secure than a 5GH network, if, for example, on the first one there are 5 100MH pools, while on the latter there is a 3GH pool (easily achievable with ASICs).
Currently, large ASICs are nothing but the best tools a pump&dumper can dream of. In addition, because of their extensive costs, the large ASICs will bring about uneven distribution for every scrypt POW coin, since only a couple of people will be able to afford them, and those people will hold far greater hash power compared to your normal GPU miner.