I certainly hope so.
Volkswagen Motorsport's spokes person has siad they are lookin for rule stability and a relevant engine rule and concept to consider it. Thats 10 brands that could be represented by one manufacturer.
Toyota and Honda are rumoured to be looking into it for the new formula but again cost is a factor.
I sit on variosu fora with reps from many of the manufactures and generally there is not a big appetite for F1. Occasionally it gets sold to the board from an image perspective but generally the market research shows very little association bewteen F1 and whta theyproduce..
Volswagen have alawayss developed their gearboxes in house. Tey never entered a rally formula with an X-trac box as far as I know. It had to be a VAG gearbox or don't do it was the philosophy. It will be that way in F1 as well. If they cannot leverage drivetrain technology then they will simply stick to LeMans, WRC, touring cars. They don't care about f1 at all. Dakar ahs done more for Touareg image than f1 can.
WRC will do more for the Polo than F1 can. Lemans has improved TDi's image with massive growth in the US and Australia, traditionally petrol markets!
The widely held fan view of F1 not requiring relevance is what is ultimately killing F1 slowly. The current fans are mostly non technical people with short attention spans. In a few years they will be following boxing or somthing else. How many watch other motorsport disciplines?
And theren lies the rub.
So who could enter?
Re-entries first
Honda
Toyota
BMW
New entries
Volkswagen (and utilising Porsche, Audi, Skoda, SEAT, Bentley, Lamborghini, or Suzuki)
Ford
Chrysler
Peugeot/Citroen (already in LMS and WRC)
Any of the Chinese manufacturers Chery, Geely, GWM
TATA
McLaren Cars (engine supplier)
Of the above, the Indian and Chinese manufacturers have the most to gain from participation as by association they will be on the quality map.
McLaren will do so for their own growth and ambition.
Of the big guys I really don't see VW and PSA/Citroen entering F1 unless the whole formula is revamped into something the people who buy ther cars wants to watch. Currently your average VAG driver preferst o watch hsi/her race around a track against Opel/Vauxhall , BMW and Mercedes AMG touring cars or watch their diesel engine lap Le Mans. Audi already has orders for a V10 TDi R10. I doubt F1 would create that kind of pull...