We now have reports that both Airbus and Boeing are looking at engine upgrades to the A320 and B-737 so as to delay the introduction of new models.
When you look at where things right now, with Boeing having outsourced its knowledge to the point that the 787 and 747-8, and Airbus still behind schedule on A380 deliveries and up to its hips in getting the A350 into development,* it is far from surprising that they putting off new development.
Airbus is in a better situation here, since the 737 has had clearance with its engines ever since it went to high bypass ratio turbofans with the -300, and because Boeing seems to be incapable of finding its ass with both hands.
Boeing went all outsource everything starting in the late 1990s, while Airbus didn’t, and as a result, they seem to be lacking basic skill-sets to actually get a plane into service.
Part of this is the difference between the two cultures: In America a skilled work force is seen as a cost, rather than an asset, as it is in Europe, and part of it is European politics, which makes it much more difficult for EADS to ship jobs from Hamburg or Toulouse.
*As well as the clusterf$#@ that is the A400M military transport, but that is technically a separate division, so it’s in the footnotes.