What loss? If they bought the ASICs / GPUs long enough ago they are paid for many times over. Even if you bought only a year before the merge if you had cheap enough power you were under 300 days for RoI on most ASICs and about the same for GPUs.
If! And for a lot, it's not the case.
So,
if we go to Reddit for example you will see that hundreds have bought gear at scalper prices during the spring and those guys will never ever achieve ROI, and there are hundreds and thousands of them, one year ago the hash rate was 700TH/s it peaked at 1Peta, with one 3090 doing around 120Mh/s you still have 2 and a half million that for sure haven't reached the break-even point.
Add to the price the risers, the power supplies, extra fans, a frame, that and that, downtime, cleaning, it adds and adds
As for the other coins that can be mined with the ETH ASICs, it's a tough call. If you RoI already on them whatever you sell them off for is profit. Or, you can keep mining at a loss at the moment and hope those coins go up enough.
A 3090 with free electricity will give you 50 cents worth of coins a day, if you want to go long on shitcoins you are far better just selling the damn thing and buying with the money those coins you feel are going up, with an older GPU like a 2080 you get 20 cents, in a year you will lose more on depreciation for the card that what it mines.
GPU miners are done for, and the ones that will rush into Bitcoin mining just because they are addicted to the game and want to make a steady income just by looking all day at fan spinning are in for a disappointment and some serious losses.