Honestly, I hope they never finish C2 (although they need an additional revenue stream from us, to be honest).
There are some great 3D platforms out there. $100 on the Unity store will get you a great state machine (playmaker) AND a visual scripting platform (UScript) that replicates a lot of what C2 offers, and throws in a state machine on top that is really quite powerful and has built in handling of 3D object actions.
For me personally, I prefer Construct remain 2D. I want to make awesome 2D games. Yeah, some of that comes from my complete failure to ever understand how to texture, bump, specular, diffuse, normal 3D objects that I'm pretty terrible at making anyway.
But that doesn't change that C2 fills a niche, and fills it well, in my opinion. And it just so happens that right now, that niche is what I want to develop towards.
If Construct went 3D, I just feel like it would get drowned out by some of the big names. There is simplicity in 2D, and Construct aims to make game development simple. Maybe not easy, but simple. <img src="smileys/smiley1.gif" border="0" align="middle" />