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Sorry for the late reply.
Based on my loose calculations I would say EOS should cost about 0.50 $.
That's if you compare it to Stratis and how many coins stratis have.
Stratis have rougly 100 million coins, and EOS will have 1 billion coins.
By using a relative model for evaluation the price of EOS should be 1/10 of Stratis, currently priced at $4.90

It's to hard to guess about the price in 2018-2020, it depends on many things like the general outlook on the market (bear or bull), and also how EOS stack up against the competion at the time