Recently there have been a number of blog posts again that have been talking about the death of SOA (again!). As I look around, the death of SOA discussions started way back in January of last year. Back when we were starting this blog, I did a number of entries around service oriented architectures - but that was half a decade ago. Sure there were some fad-like tendencies around SOA just like there are around Cloud. I'd state that SOA was a pre-requisite for cloud to move beyond IaaS.
It does remind me of a situation back when I was at a large non-US government client in the late-90s who said "What about that whole object oriented buzz a few years back, whatever became of that." In that case, it was that OO was so omnipresent that it was indistinguishable in the technology they were using. It was just part of the way things were. I believe SOA has entering that same situation. The techniques are now everywhere, therefore it is a non-issue.
At least it is not the other situation, I've encountered -- I used to be part of the AI group that supported GM in the late 80s - early 90s. There it was always a feeling that: "If we can do it, it can't be AI."