It's all about that paper.
I don't believe they should fight anyway, if one of them wanted to move up/down to obtain two belts then fine, but don't fight a considerably bigger guy just because people want to see it.
Jones is LHW champ going on HW fighter, Silva is long time MW Champ who at 37 would be wise to stay where he is. Personally, I saw all I needed to see in Silva's two fights at LHW, P4P he's a better fighter than Jones and I do not need to see them fight.
Do want to see Jones dabble in HW though.