"Becoming viable" does not mean "automatically put into execution". You still need to take overall demand in account.

Consider this: if demand was not a factor, anyone living in a moderately wealthy country would be practicing labor arbitrage and sending money to poorer places. Ask yourself why this doesn't happen.

In theory breakeven demand, but ecosystens are basically economies, so termites are break even demand, and that's not good news.

Demand and primary resources go way higher on the list.