I've been into it for a long time now, and I hold a part in 20 cryptocurrencies. But I'm not a bitcoin miner, and I agree with this huge power hungry mining being an eco problem.
But mining is only a part of the crypto world. There ara many advanteges that crypto brings over the classic fiat currencies and assets.
Also, you can find some reasoning why power consumtion is not only problem no solution kind of a deal:
Overall, I see the crypto and especilly the blockchain being the new tech revolution that could change our lives dramatically in ten years or so. We are still in the early adoption phase, but crypto is slowly gaining momentum to the mainstream.
If and when crypto becomes fully used, maybe bitcoin will not be THE currency (and most of the crypto's will fail in the end IMO) but I think some of them are here to stay for a long long time, and will ultimatelly change the world as we know it.