"murderous Lanister son"
Other than Tommen, "murderous" and "Lanister" are sort of redundant. But I think Dany feeds Jorah to her children, and Tyrion convinces her that her real enemies are not at King's Landing, but north of the wall, causing her to join up with Stannis and the hot-blooded Melisandre.
But since that's the predictable outcome, I doubt it will happen.
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I thought getting old would take longer.