They aren't that far from passing it actually.

One kinda sorta passed it earlier this year, by pretending to be a 13 yo boy. It was at the annual Turing Test event though[1].

Even if we ignore that, given the recent interest in using RNNs to generate natural language I'd say we are 18 months from being able to pass it reliably.

[1]http://www.reading.ac.uk/news-and-events/releases/PR583836.a...