I think it's interesting, and here's why.
Think about this as it relates to other common problems humans face like debt or the need to lose weight.
I can put all of my energy and focus into making more money so I can get my debt under control, but that won't matter if I have really bad spending habits.
I can put all of my energy into exercising more and burning the calories I take in, but that won't matter if I'm eating more calories than I can reasonably burn in a day.
I'd argue that doing less is still doing something. It's just looking for a solution in a different place. It's focusing on the cause, instead of trying to put a band-aid on the effect.
This falls into the category of "low hanging fruit", and one of the easiest potential sources of meaningful change. Inventing new things, increasing energy efficiency, etc. are all possible optimizations, but are not guaranteed. Eating less, spending less, and burning less energy are all but guaranteed to have a positive result.
The real question of interest is now: how much are people willing to not do?