Nope, no slow phasing out of Corona, just those pipelines have never been something Corona supports but V-Ray does (we're looking at pipelines used by VFX for example, for those where there are separate teams or even separate companies doing different parts of the pipeline, with end results that have be mastered for particular display devices etc.) Given that is what we mean, it most definitely is not 99% of our users :)
The comment made was "if you're working with pipelines relating to colour spaces and colour management" in which case that is 99% of your users, even if it's as simple as calibrating our displays or authoring our final jpegs in specific colour spaces, or shooting our own backplates and authoring our own textures etc. We're all working with colour management and colour spaces to some degree. We don't all have to be producing Hollywood blockbusters to be taken seriously.
So it's important that the software we use isn't making things more difficult and works as expected. If you're not interested in proper colour management etc then don't bother with it at all. But when you're implementing things like ACES CG for the rendering colour space, and introducing ACES OT tonemapping operators then it would be good to see a full accurate colour management rollout, especially now your host software is taking it seriously.
A simple search for 'Colour Management' or 'sRGB' or 'ACES' here on the forums will show you how popular colour spaces and colour management is for a good chunk of users.
I also notice 'Colour Managed Workflow' has finally been moved to "In Development" for V11, so why suggest 'go use Vray' rather than just "hopefully coming in V11"
Also for what it's worth, "go use VRay" might have been an option this time last year, but not that long ago, a lot of us ended up tied into annual contracts ;)
But back to the original issue .... the original post isn't about Colour Spaces and/or Colour Management.