It really remains to be seen just how durable the rest of the vehicle will be in 15 or 20 years. The daily bumps and vibrations of driving down the road day after day will take a toll on the secondary electric components, the the touch screen, doors will get out of alignment and not be easy to repair. Seatbelt fabrics degrade and airbags start becoming unreliable.

There needs to be choices for the masses in the middle class that are affordable and reliable. And arguably, if greenhouse gasses reduction is the goal, then it's more important to have more inexpensive affordable cars now than waiting another 15 or 20 years for the "trickle down" effect of overused used cars getting affordable. If those choices don't exist, then EVs won't be more the than a niche market for those with money. The mass numbers of people will simply continue to drive ICE vehicles because they are cheaper to buy and more available.

And it appears car manufacturers have abandoned that market segment and don't appear to be working on them.

When a powertrain wears out, a replacement ice will cost a person $2000 for an engine and $1600 labor. That 300 lb engine could sit on a shelf in a warehouse for 5 years or 30 years and still be an engine that works well. You want to spend a few grand more and you can make that old engine that's in working condition, essentially brand new.

You leave a 1000 lb battery pack stored for 5 years and left alone it's ruined. 30 years it's ruined no matter what. Can't just be pulled from a junkyard and taken home. It's too large and heavy. Cost an arm and a leg to get delivered to an independent shop. Not to mention the equipment needed to manipulate around 1000 lb battery packs, so no one can self replace these things. The packs can't be made new. They degrade with age, used or not. They cost more and they lose more value and only people with a house and garage can conveniently charge them.