I don't think they can make them shared. They still aren't shared in those areas in retail.
In retail, the only area that doesn't have shared nodes is Draenor (WoD), otherwise, every node is able to be tapped by, up to, 10 players before it disappears.
With that said, it should be obvious that this tech isn't something that they will bring over to Classic.
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Author of the almost unknown and heavily neglected blog: Multiboxology
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