First time I've seen the royals' annual holiday get together described as a summit, but papers need the clicks.
Anyway, I don't think they will mess with the line of succession, it is kind of the point of monarchy.
I do believe that they should amend the rules for who can be Counsellors of State to limit it to working royals only. It seems sensible to make sure anyone stepping in to represent the King is at least a little up to date with what's going on here.
I'd also be onboard with limiting the HRH to the direct line of succession only, rather than all the children and grandchildren of the monarch. That way you don't get this messy, you have it but you shouldn't use it, which is hard to enforce anyway. It seems to have worked well in Denmark (?) and is modernising without being too modernising as it were. We already have a precedent with the Edinburgh dukedom not being hereditary.
In the modern age royal titles don't need expanding in scope just limit them to those who may end up in charge. I always find references to the Princess of Bourbon Two Sicilies (as I think it runs) hilarious. Who wants to live carting a nonsense title around?