Munger wasn't responsible for Coca Cola's continued growth (and it's worth noting that Berkshire has never owned 25% of Coca Cola as another comment here claimed, they own 9.25% at present).

And there's no reason Coca Cola couldn't diversify away from sugary drinks in the pursuit of growth, exactly as they have been doing for decades. Sugary soda drinks have been a dead-end in terms of growth for a while now. The growth has gone to eg Monster and RedBull et al.