why not a new approach to quantum mechanics

In the decades after the discovery of general relativity it was realized that general relativity is incompatible with quantum mechanics.^[16] It is possible to describe gravity in the framework of quantum field theory like the other fundamental forces, such that the attractive force of gravity arises due to exchange of virtual gravitons, in the same way as the electromagnetic force arises from exchange of virtual photons.^[17][18] This reproduces general relativity in the classical limit. However, this approach fails at short distances of the order of the Planck length,^[16] where a more complete theory of quantum gravity (or a new approach to quantum mechanics) is required.