I don't think the BMD will work, because one only need to increase the speed of the missiles and the defense would fail. The modern control system cannot cope with extremely high speed of terminal descend of a ballistic missile. That's why the rationale of forward positioning of BMD to intercept the missiles at boost phase when it is SLOWEST.
There are no plans nor concepts to use missiles to intercept in the boost phase. However the ABL is intended for that role.
Optimal intercepts are done in midcourse by SM-3A/THAAD types, were the BM is relatively low on kinetic but high on potential energy. Relatively low speeds. Btw, any ABM missile stationed in the CONUS has to be ICBM capable, because nothing else can reach the CONUS.
Terminal phase intercept systems like PAC-3 and perhaps SM-2 blk IVA should be able to deal with low end ICBMS.
http://www.globalsecurity.org/space/systems/patriot-ac-3.htm
http://www.globalsecurity.org/space/systems/sm2.htm
Aster/SAMP/T will has ABM qualities and is designed from the beginning to exoatmospheric intercepts. Though an ABM variant has gone off the public view.
These systems are proliferating with an initial European ABM system from early next decade.
Contract Award for NATO’s Theatre Ballistic Missile Defence Programme
Deployment of U.S. Missile Defense in Europe Is Threat to Russia - Military Chief
Note the dates.
The threat of cruise missiles proliferation does not mean in the future, cruise missile advances stays at present spec. The advances in technology could possibily blur the line between ICBM and CM. (perhaps into a new term.. "ICCM") Couple with the fact that stealth/low visibility cruise missile is a reality, I think the fact that stealth was invented to evade the Airborne surveillance should be clear to everyone.
That seems to me to be inside the envelope of existing systems.
Re: Stealth = force multiplier - not miracle solution. Take a look at the NATO AGS, for instance. Or SAMPSON or etc.
There is also this little issue wrt RAM vs friction in the atmosphere and small missiles with little RAM vs huge airborne X-Band AESA radars.
I think you are wrong in this respect. US pour far more resources into offense capability than defense. I think it's even safe to say every military in the world put far more if not 1000x more in offense than defense capabilities.
The US generally has an doctrine for defense that is offensive in nature ie how would the US protect its troops from air attack? - Answer: Wipe out the enemy air force.
You just don't register force protection/national defenses the same way, it's just that you see offensive wars. But it is the enemys inablity to do anything about it that is protection. Also, the ability to defend enables the offense.
Anyhow, I was not referring to the US in particular. I used the term industrialized nations as opposed to developing. And the resources available to those defenses are 1000 x whatever Iran, NK, Saudi Arabia or Egypt will ever have.
And those systems already fielded or about to be fielded are adequate until the next generation of defenses are rolled out.
It is not as if what is fielded today or in the immediate future will have to face something 30-50 years down the development path of Iran. By then we will have something else.