Do what you have to do to go this year. It'll never get cheaper, and Africa is always a question yet to be answered. It could be stable and still in the budget next year, and it could be closed down where you're planning or prohibitively expensive next year.
IMO there's little that comes up close to a good buffalo hunt. DON'T lose the opportunity. If you take early retirement go anyway, then find a job of some sort for the next year to recoup the cost.
You can't buy a memory; you need to live it.
