My prediction: Jack stays on the Island with "Locke"...with the way their two characters were at odds through the entire series it seems to fit.
Desmond will merge the two realities so Sun, Jinn, Charlie and even Penny's half-brother will still be alive.
Good call. Jack is the most tragic character on the show, IMO...fitting he would be the one to take over for Jacob.
Far and away, my favorite thing from last night was FINALLY seeing that upptiy Widmore b*tch got her throat cut. MY GOD, what an annoying little weasel she was. Glad to see Widmore catch a few in the chest too - good riddance.
Where is Des though? How is he the failsafe exactly? And why would Ben stick with Locke, especially after he told him he would give him the island but later contradicts himself by admitting he is going to destroy it?