Just as people moved from gasoline powered cars to electric will investors also move from bitcoin to ecofriendly alts?
No, I think Bitcoin miners will be the ones to develop into eco-friendly machines. You are forgetting something here I guess. Technology develops thus looking back on how people mine bitcoin from CPU to ASIC and from high energy-consuming ASIC to more powerful but more energy-efficient machine. Possibly we can see mining farms being powered by renewable energy such as solar, windmill, and hydro plants which actually available in the energy industry.
We would really be heading there if this issue would continue to be raised in upcoming years towards bitcoin mining then it would really finding out some solution about it and its true that techonology does progress and we wont know on what would be invented next and this might be already get resolved
with those environmental issues but actually i dont see it to be that major and they are the only ones who do really make it a big deal
but basing off with the energy been used and with the supply where i can see to be sufficient.