I suspect AMD thought checkbox buzz words would help them sell underperforming video cards. They thought wrong.
At this point I think amd should put whatever skeleton crew on the driver team is needed to keep Vega competitive with the 1080 and divert all other engineering talent (while buying more along the way) to working on navi. If they were thinking of another half lauch with that too scrap those plans and sketch out a full launch from top to bottom.
Minimum target for high end navi = 2x Vega liquid