I'm confident that if the network doesn't double in hash once it matures every year aka grow in accordance to Moore's law, then the network will become insecure and miners will abandon it for other, more miner friendly, PoW currencies.
How do you figure? the network is supposedly already more powerful than the world's top 500 supercomputers combined. If it shrinks a little bit,
it's still plenty secure.
What do you mean by "miner friendly"