Its simple for me, more so now that Vray 3.4 is officially out, which is faster, and more solid that ever, im going to stick with Vray as it takes time to get used a render engine, I mean proper get used to it so that you got mastery over it. Everyone's needs are different, and artistic styles can sway someone from one renderer to another. Another thing is we dont all work with the same logic, so some renderers will seem easier to learn than others. I like the idea of nodal systems, but I find it confusing once iv started to build up what looks like my family tree from the past 500 years.
In the long run what MAXON is doing cant fail, IMHO they are moving forward, and investing into a area that is needed to keep up with the competition, just a tweak in their upgrade policy, and that will play well with many I think.
Dan