Not hating on Kakashi, but just what would you have expected him to do in the movie? Kakashi no longer has the sharingan, and while he may be a very capable shinobi let's be honest - without the sharingan, Kakashi is half the shinobi he was. The villains in Boruto overpowered Naruto and Sasuke, so they no doubt would have wiped the floor with Kakashi. Lee or Gai would have been a better match against them instead of Kakashi, since those two specialize in Taijutsu, where as Kakashi specialized in Ninjutsu and Genjutsu.