BCH or BTC or BSV, none will be worth mining unless there will some miners left or price will increase. So far in past it usually happened the second. If price will not increase then it will not be worth mining and few miners with highest electricity cost will stop mining.
Yes there is no point of mining especially when the market is not good and I think mining is beneficial for individuals only during the bull run as I have tried mining during bull run as well as bearish market situation and trust me I got some income during bull run and once the market stated to fall I ended up paying more electricity bills than what I have earned. I think mining is not a good idea for income.
coin price is not the only part of the profitability equation. Actually there are times when it's better mining when the price was suppressed because less people were mining. You need to add in the difficulty to see whether or not you would make more than your electric costs. Not knowing this is a big reason why people lose money mining crypto