Sorry to sound very noobish, what are the alternatives if neither of those take the reigns as the new standard? I mean DX11 has been around since 2008/9 and DX12 only since 2015 yet people seem to be writing it off already. Are games devs really going to be using decade old API's etc.?
DirectX 11 is still fully supported and updated in tandem with 12. Broadly speaking it still gets new features, without the extra work (and related performance gains) of 12.