In TFA, was Anakin Skywalker drawing Kylo Ren to the light?
If so, he failed and failed badly.
But let's chat first before we crucify the former Sith Lord.
In The Force Awakens, Kylo Ren appears to be struggling with his place in the Universe. He clearly wants to embrace his dark side and follow in his Grand Father's foot steps and finish what he started (whatever that was). He also states to Vader's mask that he wants to be shown again.
We have no idea what he was shown.
But we do know as he told his father Han Solo just before he murdered him that he was struggling with what turned out to be being drawn to the light side of the Force.
What was calling him? What was causing this? Was it Anakin Skywalker? Was he trying to bring Kylo Ren back from going full retard by partnering fully with Snoke?
If so, he failed.
But what if it was not Anakin, was there another entity drawing Ben back to the Light? Who else had reason to try? A certain Jedi Knight in self isolation at the first Jedi Temple?
If so he failed too.
My spidey sense tells me, that if this theory has any basis of reality, it will be Luke.
Of course, given that Vader is making an appearance in Rogue One, the clamour for more Vader will be big - and what film studio could resist the cash cow that Vader is? So, if Vader's Force ghost could appear in The Last Jedi or IV, having him working to redeem Kylo Ren could be a way to do it.