I drive 35,000 miles a year and hope to keep mine for 10 years which is over 350K miles.

Battery certainly was a concern and played a big part in my getting a Honda vs Toyota. I use the battery as conservatively as possible, avoid the use of cruise control (For other reasons as well) and at 70,000 miles has at least 90% capacity as new.

Like an insurance policy I bought an extended warranty to 10year/150K miles.
If that warranty expires and suppose it goes nearly flat at 200,000 I'll either drive it as is, but with less performance or find a used pack.

As we know hybrids are gaining market share and I'm sure aftermarket packs will eventually come available. Guaranteed junkyard packs are also a possibility.

If one goes to the dealer for a pack replacement, that $2,300 not only replaces the battery but also the electronic components which support it.

Honestly, I'm more conserned with the CVT failing before the battery.

Efficient drivers do it better.
1003 miles a tank personal record. 74MPG calculated. HCH1 CVT