After taking a closer look, its true that the .js file will get renewed when it times out/ your browser fetches the new version. This can take time and if you have a user base that likes everything working and not have to wait then this is a quick fix and does work.. I do agree it isn't worth updating the xml.
The older cached js file won't break anything on your boards but it will not show any hover information either, stating that the item can't be found.
So, you have 2 options really, you can wait and eventually the .js file will be fetched by your users browsers and start working again YAY! or you can temp change the template and force your users browsers to download the new js file. I guess it all depends on what your users are like and how much they whine at you. lol