Mark Webber has added his scepticism to the progress of F1's new teams for 2010.
Campos, Manor, Lotus and USF1 are all scheduled to launch their start-up projects off the Bahrain grid next March.
"It would be good to have them," Australian Webber, 33, said in an interview with the French language website toilef1.com, "but it is too early to say if they will all be there.
"We are in mid-November and the road to March (2010) is long," the Red Bull driver added.
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