If you think adding 3D will prevent C2 from getting more complicated, and more prone to issues, you're fooling yourselves. 3D will bring with it a whole slew of new headaches that aren't going to be easily solvable with a drag N drop event system such as this. C2 will need to add a whole new layer of complexity to deal with it, and in the long run, 2D game makers will avoid C2 because of this added level of issues. You will in effect kill the excellent 2D game engine to add something that only a few would actually use. I have no desire in 3D whatsoever, and chances are I would avoid using C2 because there is no way the 2D engine will not be affected by adding 3D capabilities.
I don't agree with the part in bold, because we can't know, some says also that the event system just couldn't be effective in 2D. And it is..
Yes, 3D is far more complex, And I think it should be dedicated to another program, which has the same event system as C2, but in 3D (if it is called Construct3D, I think i'll laugh) The event system is possible in 2D, and to see it in 3D isn't impossible, in fact, It's just matter of how it is designed:
-how to choose the point of view, and the region seen
-how to render objects on screen during play.(which has been done with external plugins before, so is possible)
-how to render all of that in "layout view" (maybe a system of 2D screen(s?) representing 3D, or a full 3D interface)
-having behaviours and event adapted with 3D (it can be also done)
-and the important: having the user understand that, and if designed well, the user will understand, it is just a matter of simplification yet accuracy in what the program explain.
So it can be done well, but shouldn't be in C2 itself in my opinion.