It is planned, but there are a few things to keep in mind.
You can't just implement it to support the same higher level graphics API. This is a sure way to get worse performance. The rendering pipeline needs to be reworked to take advantage of the Vulkan/DirectX 12/Metal approach to rendering. This will likely mean a different API to the end user for the lower level drawing APIs.
The need for new video cards is a factor for me as well. My 5xx series GeForce card is not supported by any Vulkan drivers I have found, including LunarG.