I believe Khronos has explicitly stated that they have no plans to move away from OpenGL, and it's also unlikely that the basic structure of the OpenGL API is going to change much more going forwards... everything after version 3.0 is just an "add-on", essentially. Vulkan is also not even really meant to be a replacement for OpenGL... it's pretty much specifically oriented towards seasoned industry professionals (we're talking 10+ years of experience) who need extremely high levels of performance 100% of the time (as it is much lower-level than OpenGL with more optimization potential, but also a significantly higher learning curve.) It's far more likely to gain traction in the film industry than it is the gaming industry, in my opinion.
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