Welcome to the forums. I was born in the year the Queen was crowned, which gave me a feeling of connection.
I would be stunned if Charles abdicated in favor of William. That would be shirking his duty. And the only king who ever abdicated was Edward VIII, a huge scandal that I doubt anyone would want to revive.
Abdication has been an option in other countries such as the Netherlands, but the UK? I highly doubt it.
I have always been fascinated by history and royalty too. I'm American, but all my ancestors were from countries with monarchies: England, Scotland, the Netherlands, and Hawai'i!