As noted in the article, homolongation will probably be problematic for the upcoming F8x model, so it was never going to be an easy road in the long term. Might as well wind it down while at the top of your game.
I think BMW will be in DTM for the long term though. The rules for homolongation don't rely on the production car's specs. Instead, everyone just runs a 4L V8. Also, I suspect we'll see the F8x in Grand Am racing, though perhaps just in GT and not in the street classes, depending on if they adjust the engine rules.
2008 Interlagos Blue E93 M3 - M-DCT
2011 Salsa Red Jetta TDI Sportwagen - DSG