Since when does the difficulty dictate the price with cryptos? It's all about the speculators, that where the capital comes from.
Your right, there is a difficulty to price relationship. If its not profitable to mine then people will not mine it and the difficulty will reduce.
Look at Bitcoin, as the price increases because of the speculators and traders the difficulty increases. If speculators decided Bitcoin was worth nothing and this was sustained, that BTC was worth $0, all those miners even the ones with ASIC will stop mining, except for the people who think that the coins are going to worth more again.
This is a issue with TRC, a ASIC will come along and because a lot of miners have been mining at a small profit with a GPU, its likely a ASIC miner will want in on the action because they will make so much money, and then they leave back to BTC because they still want BTC and then the TRC network is in disarray