Interesting stuff. While I generally think lectures should be avoided at the elementary level (and elsewhere, but that's a different story), this research has some useful applications for teaching at the elementary level.
New concepts explained by the teacher, class discussions, interview sessions, and more could all be recorded and broadcast through various online programs, allowing students (and families!) to go back and listen, re-listen to either the whole thing or parts that interest them. We could use this for students who have been absent from class or for students who need the extra time going over it one more time, but this allows them to focus on the parts they choose.
Fodder for thought.