The world at large
has millions of Admins who are probably nowhere near as talented as Mr Cartwright.
Some are just hardly worth the title of Admin but they may read this article and they try to implement the sorts of things hes describing.
What he makes seem easy is probably far from it.
IMHO, articles like this should come with BIG warnings. 'Do not try this on your live network'.
Buy hey, times are gonna get interesting with the potential for lots more critical systems and networks to go down when [redacted] try to implement SDN on their own networks.
Perhaps we'll get similar instances of the UK-ATC failure on a wider and more regular basis?
Who's got the popcorn in stock becuse it might get difficult to buy some if a few critical networks & systems go down.
The other thing that worries me and a few other IT Pro's (it was discussed in the pub on Friday night) is the potential damage that could be done by the black hats getting into the controllers of these SDN's and wreaking havoc. Imagine if this was done in a co-ordinated way, you could potentially cripple a whole nation. We are so heavily reliant upon computers that you have to ask yourself what would happen in you could'nt drive you car (traffic signals all showing red), Buy food (no orders placed), Cook that food(leccy & gas out due to computer failure) etc, etc, etc.
These whizzo things are all very well and good but... There has to be a downside to them.