Who uses these anymore? They are very, very outdated. The standards haven't changed much but the antenna technology in new routers is so much more advanced. I replaced my Airport and using the same standard 802.11ac I've seen a 50% increase in speed with nothing more than the new router.
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Accept the big change on the newest routers is the antenna tech. Everything being the same the newest routers are much faster in the real world due to this.
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There haven't been any major advances in WiFi performance since then, though. There is literally no reason to release a new router right now.
If a new WiFi standard comes along and Apple doesn't release a new router afterwards, THEN we can be sure that development is dead. But for now the current routers are still state of the art.
This firmware update shows that Apple is still supporting the products, and they are still for sale without stock problems.
Accept the big change on the newest routers is the antenna tech. Everything being the same the newest routers are much faster in the real world due to this.