Depends what era of cars we're talking. There's a ton of stuff from the 90s and 2000s like GM trucks, that I strongly suspect will be on the road longer and in greater numbers than stuff 10 years newer. The mid to late 90s and early 2000's seems to be the sweet spot where fuel injection and simple electronic ignition, and stuff using older designs (engine's, etc.) that had to be built heavier, combined with better metallurgy, better oils, better gas, and so on, meant that the vehicles, when taken care reasonably, would go well past a quarter million miles. There's a ton of stuff now, that given much weird crap is on there and how much stuff is done to squeeze every last MPG out (like a lot of GDI setups, auto start/stop, transmissions that pull into neutral automatically at a stop, etc.) that I really doubt will make it as far. Even as far as repairability, a 90's 4L60E or 4L80 can be repaired way, way more easier by way more people, in an economic fashion than a lot of later transmissions (that you may as well just throw away). I'm sure this holds across other brands too; Volvos come to mind, as the older rear wheel drive red block cars were certainly far better built, more reliability, and had an unbelievably better lifespan than the absolute garbage Volvo has put out after Ford bought them.
