The automotive landscape has changed (move to SUV's and smaller cars instead of larger sedans) and will change in the coming years (move to electric powered cars).
If the series wants to be road relevant - in other words involvement of manufacturers or importers - it has to follow the automotive landscape.
If it can survive without this involvement - technical but especially money wise - they could keep the current cars and big engines, or a similar but cheaper formula like TransAm.
In the last case it's questionable on the long term if sponsors want to be involved. Large companies want - or are forced by the public - to spend their money on a "green" way.
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