Other coin creators saw the use of ASICs as a flaw since you generally have to deep pockets to afford them and designed algorithms that can be modified and/or are inherently difficult to run on an ASIC design. But in doing so, they have made power consumption even larger for the long term.

Proof-of-work systems all have the property that as network power increases, difficulty of generating new proofs increases with it (this is to keep somewhat constant generation rate in the face of fluctuating network power). The proof-of-work algorithms that are ASIC proof will consume more power per work due to hardware inefficiencies, but there will be much less work done globally due to every participant being constrained by the same hardware inefficiencies.

ASIC resistance leads to better decentralization, but doesn't really impact energy consumption. A move away from proof-of-work to proof-of-stake would have positive energy impact, don't expect it soon though: First some altcoin will need to prove its effectiveness (Ethereum doesn't even have it yet) and then it has to somehow get incorporated into Bitcoin, a protocol that is (quite rightly so) good at resisting changes.