Today's bjj guy that doesn't learn takedowns (or train how to "not" get taken down - yes - they are out there) will be tomorrow's wrestler/judoka that wants to "fix" bjj.
No one in BJJ is interested in "fixing" BJJ. They would just train wrestling.
Your theories are interesting to read, but almost make it seem like you've never trained in either. Wrestlers/Judoka don't think strikes are useful? Do they not own a pair of human arms?
They called it mixed martial arts for a reason. Because it's just a collection of knowledge from different arts. Instead of fixing one thing or trying to make something "whole", people go else where for knowledge.
Sort of why I don't see the point of people arguing that things like sparring/groundwork/striking/insert anything here, etc should be introduced into Aikido. If you want it, there's a time and place to get it.
My opinion on the video: I thought the BJJ guy did a poor job. Not gonna go into detail, but he looked like he was deathly afraid of clinching the Aikidoka.