It's good practice to under promise and over deliver, if they'd updated their estimate to Q4/2018 in the beginning there would have been less drama. Backers have held up their end of the bargain.
Imo the delays won't matter to the success of the 8K, it only leaves a bad impression to the backers. Probably there is little brand loyalty in the VR space, so there's little impact except for killing their chances for further kickstarter campaigns.
Like George W. Bush said: "I know the human being and fish can co-exist peacefully", or something like that.