Hi ChannelGSW,
The weak link of a mattress is usually in the upper comfort layers of a mattress (and not the support components) and both the latex and the microcoils they use are very durable components so durability wouldn’t be an issue.
I also wouldn’t pay much attention to the length of a warranty which is mostly about marketing and has little to nothing to do with the useful life of a mattress (see post #174 here). The quality of the materials is much more important than long warranties that have nothing to do with the useful life of a mattress or how long you will sleep well on it.
If a mattress is defective (which is all a warranty covers) … it will usually show up very early in the life of a mattress. The loss of comfort and/or support isn’t considered to be a manufacturing defect and isn’t covered by a warranty even though it’s the reason that most people would need to replace their mattress.
Phoenix