What is wrong with this section?

At the end the video, viewer fatigue is likely to be setting in and they will stop listening. When the speaker is talking with no visuals, it is even more likely to occur. 

How to make it more engaging:

To make this section more engaging I would animated bullet points to slide in as he is hitting key points of what was discussed in the video and what to expect in the next video. This would help the viewer check their understanding of the video to make sure they grasped key points.