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You’re right in saying that these devices are basically ancient, and also right about why you should never use all-in-ones for anything that you would want to last more than a couple of years.
http://support.dlink.com.au/download/download.aspx?product=DNS-320 The age of the devices:
For those kind of devices, the manufacturer should be required to make it possible to easily load a third-party firmware when they declare a device as obsolete.
I understand it’s not financially viable to support a device beyond a certain threshold, but there’s likely a community behind those that are willing to keep these devices alive for a while longer, with the benefit of reducing the amount of ewaste.