Still now many coins are created only for speculations without any practical use. It is necessary to study all benefits that coin give to people and all is advantages. Now appear many interesting coins that offer different tools to earn money like this https://twitter.com/CsProOfficial/status/1447530144894234631
I think that miners will continue to steal electricity because it is very profitable. The profit from mining is very high and miners who steal electricity have a lot of advantages.
Miners will not be able to steal all electricity. For the biggest part of electricity they will have to pay money.
But the price of electricity for miners will increase because there is a big demand in electricity for miners.