I never thought I'd say this, but that was a WAY happier ending that I'd expected, and I knew the final line. 
 I'm still sad we were cheated out of the big fights. I was hoping on Animorphs vs Visser and Tom vs Jake - I was SO SURE we were gonna get the latter, in particular the revelation that (view spoiler)[Tom's yeerk could morph Tom (hide spoiler)] comes off as a disappointing red herring. 
 But all in all it doesn't seem a Torch The Franchise And Run - it seems a Sequel Hook. Here's to hoping for a YA Animorphs.