Greetings, John.
The warranty in my user manual regards to the basket is quoted below. I don't think the basket itself is likely to materially fail, but the integral basket hub (appears to be cast aluminum like frontloader spiders) is a corrosion/failure point.
<table border=1 width=890 align=center><tr><td><blockquote><center>LIFETIME LIMITED WARRANTY - STAINLESS STEEL BASKET</center>
For the lifetime of the washer, when this washer is operated and maintained according to instructions attached to or furnished with the product, Whirlpool Corporation will pay for FSP® replacements parts for the stainless steel wash basket if defective in materials or workmanship. This warranty does not include any polishing marks found in the bottom of the basket which occur during the break-in period of the washer.</blockquote></td></tr></table>
The trick is that nothing specific is stated regards to what is the functional "lifetime" so that is to Whirlpool's discretion. The outer tub is warranted 10 years, so I suppose at least 10 years lifetime is inferred. Some parts are already listed as NLA, although most of those are not crucial to the operation or can be substituted (lower rear panel, console rear panel, tub sound insulation, bisque top and lid, brake spring caps, rear leveling linkage, etc.)