Any reasonable MMA fan that knows who Jones is, knows what an incredible mismatch a JONES-SILVA match would be.
Seeing the best MMA fighter destroyed by a boxer would be horrible for the UFC. All the casual obtuse fans are just gonna say, "oh wow, an old faded boxer beat the best UFC fighter... i guess UFC sucks..."
Obviously not true, but Silva getting wooped would be TERRIBLE for the UFC. Dana White knows it, he'll never let it happen, and worst comes to worst he'll probably pay Silva a large sum to prevent the fight from happening
i dont see hwo it would be bad for boxing. silva was the one that called him out, and i dont think jones would try to KO him or anything liek that. he can be pretty noble when fighting mismatched opponents, i.e. the hanshaw fight, and imo he held back when he fought tito