Jeremy. You asked about Mr. Mills selling the Britannic. This is my humble opinion, and I say this from an outsiders view, not knowing the politics involved. He has a huge responsibility, but been crystal clear on his intentions of the ship, what he will and will not allow, and has not budged. I believe the Britannic is quite "safe" in his hands, and I pray he doesn't feel the need to sell her. I cringe to think of the possible schemes that would be hatched over "making money" off Titanic's sister. It would raise opposition and tension, no matter what they wanted to do. (The fate of one of Lusitanias' propellers come to mind.)
On the other hand, I am excited with his thought of someday possibly having a submersible available so novices could go and see her too. A sight I would truly love to see. (The moment I spotted a prototype submersible named "Jules" I thought of Britannic.)
Anyhow, as I stated, it is just my opinion.