I always hear this comment and yet no one can provide one example where a technology or innovation was similar in the past. From air travel, electric cars and medicine, the rich get it first before prices drop for mass marketability.
It is fairly easy, as a thought experiment, to project such a trend of accelerating accrual of benefits of technology to the plutocracy to a future point where your statement is no longer true.
It already is a multi billion dollar business. And cyberpunkish dystopia stuff like "poor get old & decrepit while rich extends youth" already exists in several ways(health, food, in US "legal roiding"... Same shit as it's always been.
Tesla was, is and for some time will be only for the rich. More adoption, competition and improved processes of manufacturing will drive the price down for the masses.