This was an amazing success especially given no equity traded hands. Game publishers shouldn't be the only ones worried. While I don't see it being easy to do initial angel funding on Kickstarter, it clearly is possible to raise significant amounts of money if you either have a good product and/or a name.
Personally, I don't really see their point. It's not an investment, it's a purchase... With a slight bit of risk. Some of the higher tiers are collector's items and a part of history, and unavailable otherwise. The lower tiers have the game for less than it will probably retail for.
I personally feel the risk is very low for both this and Wasteland 2, but others feel differently.