Dreams of a merger between AOL and Yahoo haven't vanished, but investors will likely need to wait for a series of events in 2015 to unfold before getting their Christmas wish.

Several large Yahoo shareholders interviewed by CNBC say they are effectively in a negotiation with CEO Marissa Mayer over what she will concede and when. The ideal outcome, those shareholders say, would be similar to something envisioned by activist investor Starboard Value, which took a stake in Yahoo earlier this year.