Though currently struggling for survival
That's your personal thinking. Cryptos are not struggling for survival in any way. Adoptions are increasing day by day! More businesses are opening around cryptos - these are the signs of prosperity, not survival!
If were talking about the future, could cryptocurrencies have a potential to trigger an eco friendly finance revolution?
As per the current model of crypto mining, it looks hard to happen! However, if the entire economy moves to cryptos and fiat becomes irrelevant, probably mankind will be spending quite less than what they are spending now on minting money! However, the chance of happening it, is pretty slim!