The Problem: What in the hell happened to Jacob and MIB in the flash-sideways universe?
MIB who appears to be tied to the island (other than the appearance of Christian Shepard at the hospital) probably didn't fair so well. But Jacob likely was off the island at the '77 reality split, as he was visiting a young sawyer in '76.
So we have one reality where MIB would be alive, and Jacob dead, and another where Jacob may be alive and MIB would be dead. Seems to be a familiar theme.
Which changes the perspective on Hurley's sudden connection to Jacob. He may not be seeing a dead Jacob from that reality, but the Jacob from the other. Same as his meeting with Charlie, Charlie knew he was dead, but also was still there.
Jacobs goal? To be able to merge both realities. Why? Who the hell knows yet. Maybe he just wants to be able to pop in on MIB's victory speech and tell him, "Think I can't come back from the dead? DON'T TELL ME WHAT I CAN'T DO!" ;)