However, we actually have good reasons for believing unification is possible. One such reason concerns gravity: the inertial mass and the gravitational mass appear to always be the same in every case that we know (Equivalence Principle of General Relativity.) That supports the idea that mass is a universal property of all particles, including the gauge bosons, and since they all "experience" this force, all those forces must be related.
I would like you to take a look at my book if you have any leisure time.
Bigheadfred's Incoherent And Incomprehensible Rantography