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CDs will never replace cassettes, because CDs wear out eventually and cassettes don't.

Rental companies offload their used inventory as they approach the end of their manufacturer warranty, which varies by maker, but it ain't 100s of 1000s of miles.

In the article linked down below, "Tesla now covers all battery capacity degradation in all its vehicles with a limit of 70% capacity for up to 8 years or 100,000 to 150,000 miles depending on the model... However, this Model X got a battery replacement under warranty at 317,000 miles."

A look at Tesla battery degradation and replacement in a Model X with 400,000 miles. Read the article on Electrek.
Tesla battery degradation and replacement after 400,000 miles | June 6, 2020 | Electrek.co

CDs will never replace cassettes, because CDs wear out eventually and cassettes don't.

EVs have been around probably longer than ICE vehicles, and they haven't caught on, and ICE vehicles took over and will prevail.

CDs, just like a lot of other electronic gadgets, have had their alternatives, and nobody ever expected that they couldn't be replaced. ICE cars vs EVs, are a different story, with over 100 years of history. BTW, have you noticed how vinyl records are making a comeback? Not that the technology is better, but, people are unpredictable.

EVs may be here to stay, but they won't take over, unless it becomes MANDATED by our tyrannical overlords.

Rental companies don't always wait for vehicles to be close to end of warranty. I've bought 3 cars from rental companies, and with 21,000 miles or less on the odometer.

EVs may become popular with rental car companies, but not with the everyday usage consumer. EVs still have the same problems they've always had: range (normally 300 miles or less; range anxiety; fear of getting stuck in the middle of nowhere); long-recharging times; recharger infrastructure still not where they could compete with gas stations; high initial purchase prices; most people will not install charging outlets in their garages; they're impractical in cities; they're not good for cold-weather conditions or even high-temperature conditions; and are not too good at towing anything.

IOW, EVs are a solution for a problem which doesn't exist, and the problem is not about old vs new tech (your CD analogy), and it's not about helping the climate.