Mount Everest, the world's tallest mountain, may not always hold its title. Geologists believe that the Himalayas' massive heights result from a unique combination of geologic factors, including tectonic plate collisions and erosion. According to experts, the thickness and temperature of the crust, as well as erosion rates, play crucial roles in determining mountain growth. While some scientists suggest that another Himalayan peak may surpass Everest's height, most geologists doubt this possibility due to the unique conditions that led to Everest's formation.

Source: https://www.livescience.com/planet-earth/geology/will-mount-everest-always-be-the-worlds-tallest-mountain