There are quite a few game projects on Kickstarter that will never ship, or a boarding on scams that have been successfully funded by developers that are mostly unknown. Dead Linger and Takedown are both (imo) promising way more for the $150K and $210K they raised. They are also both relying on later funding or sales to raise more money. Starcommand has already publicly acknowledged that they've burned through most of their money and are $50K in debt. I played the game briefly at PAX East, and although it has potential it's nowhere near ready to ship by their promised date (August).

Some of these games will deliver something, but that something will disappoint most of the backers. I think in many cases, even if you deliver a good product, it will never live up to the game the backer imagined when you first pitched it. All games have this problem to some extent, even wildly successful ones like Minecraft or Elderscrolls, but I think it will be exasperated by the fact that people are selling game ideas, not actual games, with a few exceptions (FTL had a playable pre-alpha during their campaign).

Game projects come in many years late and millions over budget all the time. I ain't been in the industry for more than a decade but more games I watched being developed failed to get finished than actually shipped. I doubt it's changed much.

I'd guess a game will be one of the first big abandoned projects myself.