The Kickstarter did exactly what its name says "kick starts" something, but doesn't guarantee a continuous flow of income.
They chose kickstarter, because what is involved by trying to find an publisher and secure funds to pay for the developers and expenses until the game is released.
When it's released, the publisher depends on the popularity of the game (sales) to make up for the expenses incurred during development and hopes to make profit, by selling more than just braking even.
With the Kickstarter, FD saved the hassle of looking for a publisher and secured enough funds to develop the game and not to slide into a negative balance. Again, the funds were enough to develop the game. The kickstarter pledgers and the beta backers - since they have already paid for the game - do not count as a source of income anymore, FD will have to depend on future sales, if they want to stay in business and further expand the game.
Again- the initial money gathered on the Kickstarter doesn't guarantee a steady income for years to come, because
this amount is almost nothing.