If everything in the movie really is a part of a dream and we never really saw reality then you can't trust the facts presented by the movie, they are at best completely inconsistent, and more likely completely imaginary. Cobb in reality could really not have a wife or kids--He could be a middle aged woman in Baltimore. The only thing we can take away from the last sequence is "What is imaginary and what is real?" as the movie emphasizes over and over again.
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As soon as a flow-based router services more than 1000 machines (in either direction, ie. 100 clients communicating with 900 internet hosts = 1000 machines serviced), it's performance will fail to keep up with a packet-based router. That's not a lot. If a single client torrents or p2p's you will hit this limit easily, resulting in slower performance. 2000 machines and packet-based switching is double as efficient.
Where did you get these numbers from? In the article they claim their device can do a whole lot more then that.