My fourth feeling when I read about [the Veronica Mars Kickstarter campaign] was a kind of dread. Because I realized the only thing that would be on everybody’s mind right now. I’ve said repeatedly that I would love to make another movie with these guys, and that remains the case. It also remains the case that I’m booked up by Marvel for the next three years, and that I haven’t even been able to get Dr. Horrible 2 off the ground because of that. So I don’t even entertain the notion of entertaining the notion of doing this, and won’t. Couple years from now, when Nathan [Fillion]’s no longer [on] Castle and I’m no longer the Tom Hagen of the Marvel Universe and making a giant movie, we might look and see where the market is then. But right now, it’s a complete non-Kickstarter for me. — Joss Whedon, to Buzzfeed.
There you have it folks. Joss Whedon is too busy to work on more Firefly because he’s doing all of the other cool things you want him to do. At least not until after 2015. So set your alarm clocks.