4-5 DX-12 GE games for 2016 is fine, i dont believe NVIDIA released more than 5-6 GameWorks titles in 2015.
Where are you getting even 4? So far only two are confirmed. There are a possible other 2 but AMD (nor their partners) have said anything about it.
And that's the problem. At least when Gaming Evolved was announced, it had 6 popular games at the helm. And it later added another 5-6 games within a few months.
Off the top of my head games that partnered with NV in 2015:
Project Cars, MGS5 (Questionable if it has any Gameworks code, but partnered with NV for promotions), FFXIV (a once Gaming Evolved title), Batman: AK, The Witcher 3, Fallout 4, Ass.Creed, Just Cause 3, Rainbow Six, Killing Floor 2...
Now, I'm not saying at all that Gameworks implementation in any of these games is amazing, what I'm saying is these are titles that performed subpar on AMD because NV got it's dirty hands on it.
We could also see some already released games patched for DX-12 as well, also GCN could be extremely competitive in DX-12 GameWorks titles in 2016
like Fable etc.
If AMD is gonna solely rely on DX12 without their involvement, I hope they don't get shafted by any Nvidia shenanigans. This is basically another 'wait and see' approach instead of an aggressive circa 2012-2013 Gaming Evolved where AMD was announcing partnerships out the ying-yang.
So, the situation in 2016 will be completely different than what we had in 2015. New 16nm hardware, new GE games and especially DX-12 will help tremendously the AMD cards in 2016.
Of course it's going to be different, that's calling water wet. But we're back to "wait and see" mantra that doesn't seem to be paying off too well. AMD needs to block Gameworks yesterday.