All the articles I've read have JAL bigwigs making it very clear that this is not a response to the B787 issues. What they have said is that having a single-supplier fleet is now an anomaly in the civil aviation market, and JAL are simply following suit.
That said, it's a very positive story for Airbus, and it can't be denied that so far the A350XWB project has been an exemplary tale when it comes to learning from past mistakes and applying the lessons learned. Of course, it's still very early days - and even Airbus themselves are advising caution alongside confidence.
Also worth mentioning is that we've seen the A320 programme overcome considerable adverse
PR in the early days to become one of the most successful short-haul types in the world, and the A380's much-publicised teething problems also seem to have been largely consigned to the past. Not to mention that the 747 project almost sank Boeing in its first years and as such, it would be inadvisable to count Boeing out just yet,