I think you're right, but, at this point in the story, I don't think the Horde and Alliance could return to peace, even if, just as an example, Thrall would take Sylvanas' place as Warchief. The grievances between the factions just seem too deep right now to solve easily.
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The Alliance would listen to Magni, I think, but I very much doubt the Horde would; which would force the Alliance to retaliate. To be perfectly honest, I'm not sure Saurfang would be willing to end the war. A "good" Horde and a faction war are not mutually exclusive.
If Saurfang had to choose between, "End this war or bring back the Horde as it was." I would think the latter would make the most sense. It probably is too soon to say when the war will end but my hopes are Thrall or Baine are the ones to end it on Horde side.
