Hmm, i guess I didn't make my point clear, sorry. My point was that your previously linked article (why there are no such thing as cryptocurrenciies) assumed that hashpower is fungible across altcoin networks when in fact it isn't. I only listed the coins as examples of coins secured with different hash functions, which are not mineable with SHA256 hardware.
I wasn't aware that the original source was making that presumption (well I vaguely remember an allusion to Bitcoin copy coins). It makes sense though, as it is a lot more practical to attack with ASICs you already have.
But the reason I don't think the original source means what you think it means, is because the author linked to that article again in the recent discussion of his DAO hack. So it seems he thinks it is still applicable to relevant altcoins (i.e. worth even attacking), of which none that I know of use SHA256.
Any way, it is sometimes difficult to know what that author thinks because he is cryptic.