I've had a water pump die on me within 6 months of buying a 2nd hand car. In nearly 20 years of driving 2nd hand cars I've had more issues with ICE cars I've bought than I have with the two used EVs I've bought.
With that in hand, I was confident in the health of the EV and made my purchase.
In the future it may very well be possible to do the same home repairs on your EV. We're barely past the first decade of publicly available EVs. A number of early EVs have plenty of guides out there on how to replace and rebuild battery packs on your own, and aftermarket mfgs are starting to produce speed controllers and ECUs for custom EVs.
It's just a new wave of tech, and that too will become normal over time just like ICE cars themselves.
Batteries on the other hand will eventually break down. Sure, eventually it will become cheaper to repair and replace. But the oldest EVs on the road are probably Teslas. The Model S is something like 10 years old now? And a full battery replacement is still hugely expensive. A decade on and EVs are still luxury items.
The cost of the vehicle and maintenance over 10 years would have to be dramatically less in the average case for regular people to start buying them. In that sense I think Toyota has plenty of run way.