"We'll keep trying to move forward. We're a World Championship," he told Sky Sports F1
. "We'll probably lose two or three more races in Europe as we have to sort of move on."
Ecclestone acknowledged that this may leave F1 with as few as four European events in the future.
On the subject of discussions over the new Concord Agreement, Ecclestone told reporters that the main subject of debate was not over money but the regulations that will come into effect.
"We've actually reached a very good agreement with the FIA, with Jean Todt, and the teams," Ecclestone told Sky Sports F1
's Martin Brundle. "Money's all sorted out to 2020.
"It's to do with regulations," he added, revealing that "all the teams except HRT" had now signed up for 2013. The concern of the smaller teams was the contentious area of budget caps, while the subject of an expensive new generation of turbo engines due to enter the sport in 2014 was a concern of everyone in the paddock. Ecclestone himself has publicly expressed doubts about the need for them.
"That's what we're tying to have a look at," he said. "See how we can overcome these problems."