George Foreman didn't need a world tour and he was an old champ. He did it the REAL way.

I always have had a soft spot for Tyson, but I would be very disappointed if "world tours" after a boxer's career is over became the norm. And, not many fighters, and arguably NO heaveyweights were more exciting than Tyson..so i think it's the exception that he's able to do one successfully (If it's even considered successful, I havent followed it at all). I think for many ex-champs having a "world tour" would bomb and be a failure. Only very few elite fighters would be able to attract an audience for such a thing.