Outcast 2 was another Voxel based game - also very looking.
Yet Castlestory's kickstarter went off charts...
I think ppl are bored of Minecraft clones
And please everyone, stop using "voxel game" as a definition of a minecraft-like gameplay. This is definitely not what the word is meant to describe.
Indeed, if i remember correctly Delta Force is also a voxel game (It had very impressive terrain for its time as well)
Not even close to minecraft
I wouldn't worry about people growing old of voxel based free-form shooters (or the like). Heck, people are still more than happy to play 2D side scrollers...