Mercedes team principal Ross Brawn thinks the whole of F1 may live to regret Red Bull and Ferrari's withdrawal from FOTA.
Red Bull and Ferrari, along with Toro Rosso and Sauber, decided to quit FOTA last year amid a dispute over a cost-cutting Resource Restriction Agreement.
But Brawn believes the remaining members of the organisation are fully committed to it, and thinks the sport as a whole may eventually wish the teams had stuck together.
"We are very committed to FOTA, we believe it's a great shame that we've lost some of the members from FOTA because I think we may live ultimately to regret that," Brawn said.
"When there is outside pressure it pushed FOTA together. Now, there is not so much, the natural competitiveness of the teams is pushing it apart a bit.
"I think we're very short-sighted with not recognising that FOTA has a very important role to play. I think it is unfortunately the nature of F1 that we all seem to find it difficult to come together with these much bigger issues.
"I am a great believer in FOTA, but I am disappointed with what has happened in the last few months.
"I hope we don't regret it in Formula One, because one of the objectives was to find the right solutions for F1, not just for individual teams."
