Absolutely.
There are several other makes that could be involved, but have so far not shown interest. Toyota, Mercedes Benz and BMW for example. End of the day, it has to make sense for them to do so. Although, in theory MB and BMW could leverage off their existing customer base in GT3 and GT4 as Audi does. Several TCR championships around the world share weekends with GT3 and GT4 events, so economies of scale and logistics would figure favourably in that sense.
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