You know, I thought about that when i read it too, and I left it alone, since it's a fairly technical discussion. I have to wonder just how big of a key is a mere 'impediment' rather than an impossibility...
/me leaves the whole topic alone...
I don't knoow either!
The largest known RSA (public key encryption) that has been broken by throwing massive amounts of comupting power against it is 663 bits. Remember that each bit doubles the amount of computing power to solve it, so breaking the commonly used 1024 bit encryption just in RSA would take that much computing power times about four with 108 zeros after it.