The Forbes article on which the CNET article is based (and references), has more detailed information. The cobalt oxide chemistry was also the same chemistry used in the Dell laptops which experienced a few battery fires. I also wonder if the Boeing batteries are kept sufficiently cool when the plane sits empty on a hot summer day in the sun, then brought over and used. The Boeing battery fires all happened during the northern hemisphere's winter, which makes it all the more puzzling.
Neither of the professors ideas sound quick to implement - active battery cooling or switching battery technology, then manufacturing and getting the replacement certified. The original battery technology underwent more than 1 million hours of testing during the certification process.