Even if Audi leaves that will still leave 4-6 factory cars from Porsche and Toyota (depending on whether they bring back 3rd LM cars), and that is assuming no other manufacturer steps in as 'replacement'. We know the interest from few manufacturers, Pug and BMW etc. The situation where you will only have one manufacturer left standing is highly unrealistic, and even in such scenario the others will realize that winning LM will be "easier" than in the past and they will want to join then.
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