Prince William and Kate Middleton's joint message on Armed Forces Day.

Surprising fears about the monarchy's future emerge among commentators.

Royal expert Richard Fitzwilliams voices concerns in a candid interview.

He underscores the impact of Kate and Princess Anne's health.

William and Kate are seen as pivotal to the monarchy's future.

Kate's influence spans from early childhood studies to public engagements.

Princess Anne's recent accident highlights unforeseen challenges.

The expert contrasts her views on a streamlined monarchy.

These developments raise questions about the monarchy's resilience and continuity.