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 :)
"(and Corona for some reason is archviz-first)" - that is always what Corona has been. It was built for that purpose, with Adam one of our founders coming from the archviz field with the insight that V-Ray did too much and an engine aimed squarely at archviz that removed the excess and was built for what archviz folks did daily would be much welcomed, with folks like Recent Spaces, The Boundary, AsymmetricA etc. being there as our testers and feedback cases for version 0.1 and onward. So it's not "for some reason", it is THE reason for Corona existing at all!