The two boys have already made it clear that as HM the Q and Nick the Greek power down they are going to be taking a far greateer active part in promoting those things, like the Invicta (?sic) games, that they are interested in.
I don't see why this will change when Liz and Phil die. I think currently they already have free reign to support causes that interest them. And this is hardly new - Charles has been doing it for decades - indeed he has had a lot of flack for pursuing his own interests and agendas and interfering when perhaps he should not have.
The have also made it clear that they do not intend to sit back and get paid for doing diddley-squat.
Well now that's an interesting comment. The question arises whether Royals should effectively engage in public duties, in effect full time, or whether they should have their own career and do the occasional public duties. This is where there have been issues in the past, and I see history repeating itself. Think back to the 70s and 80s - both Charles and Andrew had 'careers' in the armed forces, but both gave them up to become 'full time' Royals, in part linked to being of an age where they should be settling down, marrying and starting a family.
Sounds familiar doesn't it. Now I think most people might accept that Charles (as directly in line to the throne) could perhaps be justified in being a full time royal. But Andrew - I think with hindsight he would have been much better off perusing his own career throughput his working life. And I think the same is true for William and Harry - the former (directly on the line to the throne) is perhaps justified in a full time Royal career - the latter, well I think not.
And actually given the longevity I think it is rather better even for the person directly in line for to the throne to spend their working life in a broadly normal career, given that they are likely to be in their 60s or 70s before becoming monarch.
They, if no-one else among the Royals, seem to realise that they live in the 21st century and the 'times they are a'changing'.
Sure they have somewhat different personalities compared to earlier Royals, but other than that the approach is identical to the last generation - think 1987 - peak Charles & Di, Andrew & Fergie - all that 'It's a Royal knockout stuff'. It's basically Will & Kate, Harry & Meghan but perhaps with somewhat poorer PR advice back then.