Earlier quoted context omitted.
> Other blockchains are vastly expanding scalability, as well as eliminating the energy usage. The energy usage combined with proof of work is the backing. If you break that for Bitcoin als is left is trust. The energy used and consumed is like the USD tied to gold (which it is no longer since quite some time)
You can do proof of work based on random memory access for example rather than pure computation. The monetary cost ends up being identical, but it’s much better for the environment.
Why? If OPEX is reduced (lower electricity costs), it's logical to assume that it will be replaced with CAPEX, given how competitive mining operations are. If that's the case, that will mean electricity being used to power ASICs being replaced with chemicals required to fab semiconductors (along with electricity for those fabs). It might be better in terms of GHG emissions, it would be a wash for overall environmental impact.