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WE are talking about need of having Dynamic Global Illumination. What technique that will that be exactly, is much less relevant.
VXGI actually doesn’t showed much of things that wasnt being thought before. Voxel packing, can be achieved in OpenGL using 3D texture and sparse_texture extension. It should work from Radeons 7xxx and GeForce GTX 5xx (bar in mind newer GPUs have better support for sparse textures).
Rasterization is interesting and it is only real thing not present on older GPUs. But this issue can be omitted by using bigger voxels, rasterizing only static object. using cascading, prevoxelizing scene only once for static objects, and voxelzie only dynamic objects on run time.
Either way, dynamic GI or at least one that doesn’t require hours of pre computation (like Enlighten in Unity 5 is fast to precompute) is big selling point. As it either make possible to create more dynamic games, or at least do not spend hours waiting for lights to bake, just to discover that we don’t really like this lighting setup after all…