In the Uk many of the Jewels are prvately owned by Queen Elizabeth II. So if she wanted she could also leave some of them to Abnne, Andrew and Edward or to her other ghrandchildren and not all of them to Charles. I think they best she could do wioth them would put them all in a Family foundation and give out loans from it.
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Yes, but it is to be expected that she leaves most of it to Charles, because the others would face huge taxes, right? It's her private property, but I think she understands the historical importance from a lot of pieces in her collection. I sincerely hope she will leave almost everything to Charles, which I believe she will (=> she loans pieces to family members, she does not give them away, so I think this is a sign that she wants to keep te collection complete).
As for the other Royal houses, the future for the Norwegian jewels is looking very good IMO (the main pieces will stay with the main line for MM en later for IA).
The Spanish Jewel Future is looking bad, since I doubt Queen Sofia will give everything to her daughter in law. I perfectly see her giving (almost) everything to her two daughters who don't need jewels at all and will probably sell everyting. If I understand Stefan correctly, it is possible that the Cartier Loop tiara and the Cartier Pearl and Diamond tiara will stay with the main line. That would be at least something. It would be nice if the Prussian tiara would go to Letizia, since it is her wedding tiara. The Prussian and both Mellerio tiaras seem to be Queen Sofia's personal property, so I really hope she will be smart enough to keep them in the main line.
I hope Queen Margrethe will leave the Baden Palmette and the Aigrette to F&M. It would be nice if princess Benedikte's jewels will return to the vaults, although I highly doubt that too. It's a pity though.