They claim that their technology will "replace fossil fuels". If it actually hits a price point where that's possible than I'd expect it to not be a problem either way.

I guess in that future we're getting power mainly from renewables and using hydrocarbons as power storage? We'd probably be using those same hydrocarbons to make plastics and the like as well.

Still, halting new fossil fuel extraction would be an excellent first step, even though the energy costs don't make much sense to me.