My humble opinion: It really is ok even if eBikes are replacing normal bikes. They are not using up that many resources. The battery is kind of small, so the environment impact is not that much. They might be heavier, but we are still talking about a few kilos of steel max. You might get a little less exercise, but you still get some exercise. And an eBike does use almost no electricity, so we can ignore that, too. So who cares?

(And there is also a lot of discrimination going on here: eBikes are great for people who are not as fit as you are. eBikes are great for older people. eBikes are also great for people who want to commute by bike, but who don't want to do half an hour of exercise before and after work. That might be great if you are sitting on a desk the whole day, but it will break you if you work physically. You also can't see how healthy people are - some heart problems will totally wreck your ability to crank out the watts)