FWIW, DH has stated multiple times that the methodology he's imparting is not to be hoarded. For the teachers who attend his workshops, he is expressly teaching them with the mutual understanding that they will a) diligently pursue the material and be able to walk the talk, and b) diligently and accurately impart the material to their students, and not use it as a tool with which to selfishly increase one's ability while leaving the student body guessing.
Sooner rather than later, relative to the timeline of the history of aikido, there will be several aikido teachers who will be able to make good on both criteria.
There are already several very senior (6th and 7th Dan) Aikikai teachers in the US who more or less openly acknowledge Dan's influence (no need to refer to him as TGWINLPOTF any more, I guess
) on their personal development.