The lifetimes of battery packs have been greatly underestimated by detractors for quite some time. Hybrids have been on the US market since 1999, and battery life has never been a serious issue. The new batteries are far higher quality than the old ones anyway.
3-4 battery replacements over 20 years isn't anything close to what a Model S will require. Do you have a source for those figures?
3-4 battery replacements over 20 years isn't anything close to what a Model S will require. Do you have a source for those figures?