I have a hard time to believe that anything more than like 3 to 5 million dollars are even possible with Kickstarter (at least in one month). Also, as everyone probably knows, it's unlikely that this will hold up for a longer time... And: If the games made via Kickstarterfund tend to be ****, nobody will give money to it anymore anyway.
Long story short, yeah, I am pretty sure you can't survive over a longer time just with Kickstarter-like stuff.