Whilst I would agree that CAP and AEW is the way to go, it probably comes down to what threat your country models for. A Falklands era Type 42 would be overwhelmed by 2x2 ships arriving simultaneously, maybe under optimal conditions a Type 42/22 combo could get enough missiles in the air to just about survive 2 x 4 ships, im not sure. If we look at the exocet threat ,they only had 5 missiles, fired 2 at the task force I think on two occasions,hitting sheffield and the Conveyer on two missions, but they had 14 Etendards, so had missiles been freely available , and with only SHAR providing cover they could have overwhelmed the RN fleet easily. That looks terrible for a navy on the receiving end but roll on 28 years Australia will have SPY on the AWD.
Now how many inbounds can SPY take out?, I know they only have three directors but I assume each is needed for the very last few seconds of intercept?. We will never be told the figure, but improved from the falklands era? yes definately.
I read an article about the Kidd class when the were upgraded for Taiwan, I will try to find it .In some computer model wargame, a Kidd downed 16 Su30's before being sunk, which is pretty impressive, afterall, what small nation would want to lose 16 jets? China would, 64 Sukhois for 4 Kidds might be fair odds to the most populated country in the world. Its different if you face a smaller nation. If country A has 16 mig29's in its inventory then an AWD is too tough a target, it it has 200 Mig 29's then maybe not, but who has them in those numbers? Only the big boys.
I assume AWD and SPY is a big step forward from The Kidd class, which I think were based on the AEGIS rival, the NTU new threat upgrade, designed to modernise the 1970' era US fleet,so I suspect they can handle a very large number of simultaneous threats, the question is, is that number too big to make it unpallatable for an enemy to even try?
There arent many airforces willing to risk losing two squadrons of expensive aircraft just to try and sink something protected by an AWD.
The AWD is designed to defend against saturation attacks, the last country, Argentina, that expended 50% of its airforce has never recovered its pre war strength.If you can service and simultaneously support and deploy 15 aircraft and 30 anti ship missiles at one time, in one throw of the dice, you might just sink a Hobart, If you cant then would you bother?
Anyway Im slightly lagered, so I apologise for anything stupid I have just typed.