I don't think anyone is going to greatly miss support for the nslu2. It can no longer be installed using d-i anyway. I imagine most of the deployments where it makes sense to still be using a nslu2 are ones where running an old kernel version doesn't much matter.
The iop32x boxes are rather more expandable and tend to lend themselves to being important little servers on a LAN, which would be painful to lose support for. -- see shy jo
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