It is already here, Katherine, just because things are not talked about doesn't mean they don't exist. I am not saying one is better than the other. I am saying it seems like anyone who is looking for internal strength is coming from an Aikikai background...I could be wrong about that.
Which -- even if true -- could mean that Aikikai is missing something that is present in Tohei's lineage, but could also mean that Aikikai is more diverse and more open to outside influences.
Again, my experience does not indicate that either group produces noticeably better (or worse) aikido.