Can you do the calculations on if they bought BTC at $18,000.00 and held it versus buying an S9 for $2200.00 and mining BTC all the way down? Cuz I bought S9's for $1500-$2200 and mined and sold BTC all the way down. I NEVER held BTC because I KNEW it was way overpriced. My machines paid for themselves in no more than 2-3 months and I didn't lose any $ on BTC. So there might be some fallacies in your argument.
If you dont have faith in the sector then you shouldnt invest in the sector. I would be willing to take a loss today for what I think the future price of LTC will be in 3 years. Sure a healthy amount of skepticism is necessary but to think that you make a better decision by cashing out now rather than wait for the next spike is pure and utter foolishness.