Even though a Season 11 seems possible at this point, the uncertainty surrounding the show’s future made crafting the end of Season 10 difficult for executive producer Stephen Nathan. “We had planned a couple of really good cliff-hangers for the end of this season to lead us into Season 11,” he tells TVGuide.com. “We weren’t really able to do that because if by some chance the show did not come back, it would have been such a disappointment to the audience, who has stayed with us for so long, to just drop everything. So, we weren’t going to do that.”
Instead, Nathan had to build an ending that could give some closure but also leave the door open to continue. “We’re threading the line,” he says. “Because we haven’t gotten the official word yet… we have to operate under the assumption that this could be the end of our relationship with Booth and Brennan and these people.
Source and more: TVGuide