In 30 years, every road that exists currently will have been replaced. The question is if it should be replaced with another road, or should some of them have larger sidewalks, bike lanes, bus lanes. Amsterdam has been doing this for decades and it’s going very well. They spent money that would’ve been spent rebuilding a road on making it a better general transportation option.
Your mileage, ironic phrase noted, may vary.
With vehicles being as expensive as they are, some people prioritize the one vehicle that can suit their regular _as well as_ occasional needs.
To put it into terms this crowd might understand better, to a lot of regular people the wildly expensive and overpowered computing hardware we own seems like a ridiculous waste. And certainly, we don't need all that horsepower every minute of the day. But we need it from time to time.
I can see what you're about to say though: those people who buy trucks should just drive some crappy little three cylinder for day-to-day use and rent a truck when they need it. To which I'd ask, how would you react if someone who knew absolutely nothing about what you do on a daily basis told you that you should just buy a dinky little Chromebook and spin up a beefy EC2 instance every time you need some horsepower?
Maybe you don't understand people's needs and motivations as much as you think you do. And this is frankly where a lot of resentment to the climate action stuff comes from. A lot of know-it-alls lecturing people on how their lifestyle is completely idiotic based on very little understanding of how those people might actually be living their lives.
"I see a pickup truck with nothing in the back, therefore in my expert opinion you don't need it."
"Maybe you don't understand people's needs and motivations as much as you think you do."
It's the opposite. You're confusing "needs" with "wants" and extrapolating the needs of the very, very few people who genuinely need a truck onto the entire population.
The vast majority of people use their cars to transport only themselves to work each day, then maybe pick/drop off one more person, then maybe go buy groceries.
I don't think you quite understand just how ridiculously niche valid use cases for trucks are. It's literally just towing, or some very specific off-road hauling. Everything else is going to be handled way better by something else, starting with a regular car, ending with a van.
Hell, for most people even a car is way overkill, a bike works perfectly fine to go to work each day, I assure you. So does public transport. You don't need 2 tons of steel just to to move your 100 kg body around.
To your analogy, I can use my dinky little chromebook 99% of the time and only boot up my PC when I actually need the power.