What if it fell so low during the halving that miners couldn't recoup their costs?
Difficulty adjustments happen every 2016 blocks or ~2weeks. With such decline in price, some miners would shut down operations due to the costs, and this would lower the hashrate, dropping the difficulty level during the next adjustment. This drop will attract new miners.
It is a self balancing system.
During a world war, I'm sure a lot of assets would be destroyed. But is BTC particularly vulnerable?
During a hypothetical world war, ease of carrying money around would be paramount, with bitcoin doing that better than almost all assets. It is also not as restricted as fiat to the country where it is the national currency.
A big draw back to be how it is heavily dependent on the internet, but if you only want to store your assets, Bitcoin would function well and can hold its value through it.
- Jay -