I suspect it's actually the minority who would be unwilling to sacrifice. Most people sacrifice every day, seemingly more and more every financial quarter, but not for any greater good. Just so that wealthy minority can pad the bottom line they think will make them safe in an increasingly precarious world.
We can reach the yellow line, it would just require telling the fossil fuel industry to get fucked, and rapidly investing in green energy, reducing waste, and probably stepping on the toes of the Millitary Industrial Complex.