I personally think it highly unlikely that regular marines will be phased out. They have created a distinct sub-faction with the Primaris, with distinct disparity in weapons, numbers, transport options and arguably battlefield roles. If they were seeking to replace the "regular marine" range they would not have gone to such lengths to establish that disparity. That said i wouldn't be surprised if the regular marine range gets scaled up a bit as it is re-released, so that it's somewhere in between the size of the current marines and the Primaris ones. This would be a good thing overall imho, though it's bound to p**s off a fair portion of players.
As for Chaos marines, unfortunately you probably picked the worst possible time to have invested in them, as most of their kits except Plague Marines are long overdue a replacement, and this is most likely to happen soon with the upcoming release of the new codex.
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