A royalist I am not, and I abhor status and wealth simply because of who you or your ancestors are/were. However, I have great respect for the UK queen, who has been on the throne for 70 long years. She has been a symbol of stability all that time. In all my years, I cannot remember anyone else. I think Charles will have a hard act to follow.
If the UK was to become a republic, I cannot think who would be president! Nobody comes to mind as a really well respected person.
Maybe the future is a reformed monarchy with less stuffiness and fewer "hangers on"?