This would force Java tools vendors to focus on the application server rather than split their time between the IDE and the application server, which is not necessarily a bad thing, but it's unlikely to gain traction.
A growing number of tools vendors continue to move their IDEs to the plug-in-based Eclipse. This gives them more time to develop innovative RAD techniques for emerging technologies that, while requiring proprietary extensions to the application server, are quicker to deliver on the promise of true RAD, because they are easier for developers to learn.
IBM and others on the Eclipse path are following Microsoft's successful strategy: Microsoft let independent software vendors extend Visual Studio, thereby making Visual Studio the de facto standard IDE for developing Windows applications. Although standardization is generally a good thing, standardization on a single framework may result in a loss of features, functionality and the ability to differentiate offerings.