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Because I'm a nolife loser, I did this pic related (using the NA release dates).
Using the averages (and ignoring the obvious trend of increasing gaps between originals and remakes), you'd expect D/P remakes in early 2018.
Following the normal gap between originals and "improved" (e.g. R/B to Yellow gap, G/S to Crystal gap, etc), I'd have expected Z to be late last year.
Using the average gap between generations, I'd expect the Gen 7 games to come out late next year.
But all of this is based on averages and software development doesn't work like that. Just my guesses though.