Depending on your perspective, every expenditure and experience that money can buy, can be viewed as wasteful and harming the environment. For someone with no access to water, a long shower feels very wasteful.
If we don't actively come out of this dogma and not embark on some ground breaking technology, our lives won't change at all. So many new technologies from aircraft and space technology have made it to mainstream - Kevlar, carbon fiber to think of a couple. So, even if Boom ends up building only billionaire's toye, there is a possibility that second and third order inventions can make it to mainstream society and bring about change at scale.