If it comes to it, and seems less likely now than it did 24 hours ago. If the breakaway series really is established, the FOTA series has to serve a more purist and dedicated audience than the one that will watch the new and "improved" Mosley run Formula One.
Bernie Ecclestone says he will lodge legal action against the FOTA teams if they try to lure away any current TV stations, sponsors or venues under contract with the FOM. So The breakaway series need to make a schedule without inciting the ire of Bernie Ecclestone.
Formula One in the 21st century has lost its focus, in the current schedule there are three races in the Middle East and five races in the Pacific Rim. But no Grand Prix in North America and the race at Magny Cours is cancelled this year and in jeopardy for the future. The FOTA led series needs to fix this, without trying to break any agreements it has or used to have with FOM
So FOTA need to reemphasize the unique "Europeanness" of Grand Prix racing. They can do this very easily.
Formula One will be moving to Donington, so Silverstone will be available. Any of the Ferrari related circuits in italy would be awesome especially Fiorano or Mugello.
Most important of all despite all of the ill fame it has received after that fatal weekend in May of 1994, Imola must return to grand prix racing.
Jerez, the Algarve, Zolder are all good options. Another one would be the Hockeinheimring, Formula One does not intend to return there after 2010 and it is a classic and hallowed ground for Grand Prix Racing. If they could restore it to its former greatness even better. Returns to the A1 Ring and race in South Africa either at the classic Kyalami circuit or at the Durban street circuit would be nice additions.
Paul Ricard is a great option for races to be held in France, another possibility could be a street course somewhere in the Riviera to try and compete with Monaco.
In Japan, Fuji, despite its flaws would be a good choice, especially because it's owned by Toyota. Mont Tremblant would be a good replacement for Gilles Villenueve in Canada. In the United States the optios are limitless, Indianapolis if Formula One doesn't return, if they do return then Watkins Glen, Laguna Seca or Long Beach. Two grand prix in the United States would be even better.
A Mexican GP could return to the Distrito Federal at the Autodromo Hermanos Rodriguez, for the Brazilain race, Grand Prix racing could return to Rio de Janeiro and race at Jacarepagua.
I don't know much about racing in about Australia but the circuit in which the Bathurst race is legendary for a reason so that would be a good place to run a grand prix.
These circuits would be a nice basis to run a series that could legitemately rival the FIA run Formula One. By returning to some of the classic, great but forgotten circuits from the history of the golden era of Grand Prix racing