I don't know, but that just doesn't sound right at all to me. At a glance all websites seem to indicate that if Brenda abdicated (no, I don't think she will) then Chas would get it, which rather scuppers your theory, no ?
From the telegraph - "86-year-old Queen shows no signs of passing on the...
Of course he's not obliged to do it, and if he can't just step aside, he can take it and abdicate immediately. He has a life that he enjoys, it's far too late to change all that - even his mother no longer does a full schedule any more. I don't care less either way, just never thought he'd be...
Didn't say it was. If Brenda hang on for 10 more years, Chas may well not still be around. Even if he was, he'd be over 75 and I think he would be "advised" to give it a miss and pass it straight on to Wills.