So let's go back to the title of this thread and instead of "but other things are also wasteful" shit, let's discuss the issues:
1. Do you think this huge energy usage is normal? (and technologically perfectly OK and acceptable)
2. Can this be sustained for years or decades? (specially that it is supposed to increase)
3. Is it a systematic risk to the existence of the network? (due to mining ban, economical unsustainability, etc.)
These are the real issues, not driers... And let me answer them objectively:
1. No, it wasn't intended like that and it is not normal. Technology should be improving all the time, not going backwards.
2. No it can not, something has to give eventually.
3. Yes. It is a huge risk as the title of the thread suggest it.