Anyone care to speculate on what will happen to the Parker siblings? The chances that all of them will die at some point seems high because it's been a constant pattern in TVD and TO since the beginning that all recurring characters will die, often in the season they are introduced in. The only two exceptions I can think of are Meredith Fell and Sheriff Forbes. One of them is simply written off as leaving town and married someone, and Sheriff Forbes, the longest recurring character is running out of time. So back to the Parker siblings. What will happen to them?
I believe that Kai will definitely die, he might have become a favorite character to many fans, but he is also the first villain who is hated by everyone, unlike previous enemies of the Mystic Fall gang. As for Jo, Liv and Luke, while it's hard to guess if Kai or somebody else will kill them. But they will bring Bonnie back at some point, and I doubt the showrunners and going to give so many witches to the MFG as allies or friends. For Jo and Kai, even though they showed in the latest episode that Jo is much weaker than Kai, I have this feeling what will happen is that Jo will win in the merge and Kai dies, but somehow Jo will become like Kai and goes on a rampage then Luke, Liv and MFG will be forced to kill her. Perhaps Luke and Liv will die as the result.