Yes, the rich should pay more, a hell of a lot more. I’ll go further and say that in a perfect world they shouldn’t be allowed to become so wealthy in the first place because the only way to do that is through exploitation of collective resources and other people’s labour.
Yes, Great Ormond Street should be fully funded via the government, as should the rest of the NHS. Yes, it should be stable and not subjected to party politics, disaster capitalism or grift. We’re a very long way from any of that though and we are talking about children’s lives. And even in a perfect world, more money will still be of use.
Children need new stories but they don’t need new Peter Pan stories specifically. Moreover, writers and other creators who want to write new Peter Pan stories can still do so. They just have to pay a percentage of the income from the use of this particular IP in the UK as royalties.