Lotus already on 2014, Ferrari will soon migrate to 2014 car (in matter of 3-4 races IMO), what about RBR and Merc?
Both haven´t pulled the plug yet. Merc thinks they still have a chance, as they feel better now after the Hungary race, concerning their understanding of the tyres. AFAIK there are still a lot of parts in the pipeline.
RBR is waiting for the competition to give up on the year, that's when they´ll pull the plug. Not surprising, them having the biggest team and the most resources available, they should be able to do both.