Google search volume shows the trend. what happened to enterprise mashups?
It is possible that the process continues, but that the term has fallen out of favor. Consider "unified communications." It would be hard to argue that adoption continues, but the term doesn't have the hype value it did several years ago.
On the other hand, it is possible that "mashups" are just another victim of misplaced optimism. Not all innovations succeed; not all are adopted as originally conceived.
Perhaps "mashups" have become relatively mundane because creating new widgets or apps from other existing apps happens at a practical, relatively small-scale level that doesn't drive the creation of huge new markets, which is one driver of hype cycles.
Maybe enterprises simply aren't talking about their mashups. Or, it could be that the new apps are too hard to create, too expensive or offer too little return on effort.
It is clear there isn't much talk about the subject in 2010, compared to 2008.