Changing of the guard

If the average tenure for a chief executive these days in a quoted business is under five years, and for those in private businesses slightly more, then Simon Kossoff, Russel Joffe, Robin Rowland, Clive Schlee, Harvey Smyth and Andrew Page, with a combined tenure of more than 60 years (an average of 10 years each), are all due for replacement at some point soon. When it happens, who from the next generation will take over?