Nine teams have decided to wait before signing a new commercial agreement with Formula One supremo Bernie Ecclestone.
Ferrari are the only team to have extended their committment to F1 from 2008 to 2012, while the others have threatened to join a breakaway series.
The sport's governing body, the FIA, has suggested measures for 2008 including a single tyre supplier and a reduction in aerodynamic downforce.
The nine teams have asked the FIA to postpone a meeting on those changes.
Other changes that the FIA is planning are for telemetry to be eliminated, standard brakes introduced and rpm limits imposed on engines.
There would also be no spare car and race weekends would be reduced to two days.
Ferrari also opted not to sign a cost-cutting voluntary agreement limiting teams to 30 days of testing during the season, although all the other teams did.
Those teams and Ecclestone signed a letter to FIA president Max Mosley saying it would be premature to discuss his latest cost-cutting proposals and outlining their own way forward.
They plan to sit down with the FIA after the first three races instead.
"The commercial side and technical side will all be wrapped up together," Ecclestone said. "There's plenty of time to get that done."
The existing commercial deal, the Concorde Agreement, expires at the end of 2007.