I don't think any of us has a clue what it takes to negotiate a trade from a GM's perspective. Too many variables go in to making a trade that none of us have considered. Both GM's must feel they each are improving their respective teams, without weakening their teams in other areas. That's harder than we might think.
Consider Brandon Phillips. The entire off-season has been dedicated to sending BP packing to a new team. But when you think about it, it really makes no sense to even trade BP unless the Reds have a Gold Glove caliber 2B hidden somewhere who will give them equal or better offense. A declining Brandon Phillips will probably be better than half the starting 2B's in baseball. Say they do trade BP for an upgrade in LF, that still leaves huge question marks at C, 3B, SS, and CF. Plus, they've created a black hole at 2B.
I understand the frustration. But Walt cannot force any GM into making a deal.