You are only seeing this from an American viewpoint. I think you should start by comparing the amount of water used by American tub machines and European drum machines (you can find the info on manufacturers sites). You’ll see that if Americans used drum machines, they would save HUGE amounts of water. But there are new washing machines on the horizon using less water than drum machines and even using no water or no detergent at all (run a check on the internet). As for line drying, personally, I have never owned a dryer and I’m sure I’m not the only one. But I don’t live in the US. I worked in the California for a while, and I just couldn’t believe it when I saw people were using dryers in a part of the world where in hardly ever rains. Now, comparing the Philippines (where I have also lived) and a highly “developed” western society like the US is a bit silly. The cost of manpower and the social (shared) advantages offered by US society to its citizens can’t be compared. In the future, we could have shared laundries, but the cheapest would remain the do it yourself. And one last thing, we could have less to wash if we were more careful about our clothes and if we only washed what needs washing, and not everything all the time.