This question was closed as off topic.
Also, this proposal was closed as duplicated of ServerFault.
Shouldn't one of them be reopened?
Your question seems to be about a a piece of gear primarily aimed at consumers. Which is why it got some close-votes here.
Your question probably would have been closed on a site suggested by that area51 proposal, since that proposal also seems to be aimed at professional gear.
It probably would have stayed open on superuser, though I am sure it is a duplicate of some question that already exists on ether serverfault or here.
You are also questioning the existence, of an extremely common device. I think it would be extremely difficult to find a consumer 'wireless router' that doesn't have a few spare switch/hub ports. Almost every 'wireless router' sold recently is a wireless bridge, a wired switch, a router, with a NAT firewall, all the done in the installed firmware. Such a basic question doesn't really fit very well with the professional system administration focus of serverfault.
I don't believe so: Your question isn't really "off-topic", though probably better for SU as Zoredache mentioned but it's been answered and as it's also something that can be answered by a few seconds on Google I don't think it needs to stick around for posterity.
Your proposal does have some merit, but the close reason ("This proposal would tend to drain audience from another Stack Exchange site.") makes at least as much sense: Networking topics have a home on SF, and there probably isn't a large enough audience to justify splitting it off just yet. (That said at some point a networking site might be worth having, though personally I don't think we've reached that point yet).
That proposal should be closed. The sample questions are obviously well within the scope of SF. SF is for Server, Network, and Client Administration (details are in the FAQ).
There is misunderstanding of the SF and SU sites in regards to networking, software, and other topics. The simplest answer is just pick one, and if it's in the wrong place we'll move it for you. But, all these topics fit into one or the other already.