As much as I love the idea of kickstarter, I have now seen first hand how you can be cheated and just can't trust the system to work (although many have and it has worked for them). After the disappointment of Minecraft when Notch started making a ton of money I have simply stayed away from all crowd sourcing/buy-and-play-during-alpha projects for good. There is nothing wrong with simply waiting until something is finished to buy it.
These things combined make some people upset with Notch. Apart from this, nothing really happened with Minecraft. It continues to be a highly successful game and frequently gets new features.
Nothing to be done about it, really. You can't please everyone.