Will pbe Swain changes make him viable top?
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Take grasp swain top. Play safe early, proccing it as much as possible. Get your ROA then build full tank with maybe Liandries. If you play it right you should roll out of lane with 2500 HP.
PBE Swain will do what grasp does by passive, letting him take either phase rush or electrocute without being too squishy, and giving him awesome scaling akin Cho'Gath, exactly what he needed to be played top lane. So yes, the new changes will definitely make Swain more viable top. Support too, because you have double the chance to get souls, and your ADC can have CC to proc it as well.
Combo new passive and Grasp and well...
How does rolling out of lane with 3K Hp sound?