The Mummy 4, rumored to be named The Mummy: Rise of the Aztecs, would have brought the series to South America. With the failure of Universal's Mummy reboot, now would be the time to make The Mummy 4. Have Brendan Fraser and Rachel Weisz return. (Even if they are side characters and the movie would be more based more on their son.) Bringing Antonio Banderas in as the main villain would definitely be a nice touch also.  This would be the perfect chance to correct the mistake that was the horrible Tom Cruise Mummy abomination, resurrect the careers of older movie stars, it also gives the chance to make new ones. Also having The Rock returning as The Scorpion King would be the icing on the cake.