This kind of a GTE sprint series would surely be cool to see. But I'm not sure if this is feasible. BMW and Porsche would probably be in but all other manufacturers would be more or less question marks. Ford may leave GTE once the current program comes to an end. Corvette does only IMSA, Aston only the WEC, so an additional DTM program might not come into question. And Ferraris in GTE don't quite seem to be such full-blown factory entries like other brands; would Ferrari enter cars into DTM then? Maybe some smart scheduling might allow the DTM program alongside the WEC, although the field would still not reach the current 18 cars.
I'm just a bit skeptical about this, I mean if there were enough cars. If DTM decides to switch to GT machinery, GT3 machines would be more economical, and there would be more manufacturers to fill the grid.
DTM has looked like a place for manufacturers to promote their sedans with high-performance silhouette cars. GT cars would be a step away from that, although the M8 actually looks almost more like an executive car than a sports car. That being said, maybe something needs to change in DTM for the series to survive. But I'm quite skeptical about the GTE idea. On the other hand, the current formula isn't attracting new manufacturers. And a switch to TCR would be quite a cut in performance. I'd like to see them adopting the VASC rules. I think those are the coolest looking touring cars in the world, and a shared platform could attract manufacturers to both series.