So you would have bet the future of an entire industry in the German governments ability to actually get the electric grid ready for everyone moving to EV?
No, that isn't a relevant risk. German car companies are mostly export-oriented. Of course the home market is mostly theirs, but if Germany were to lag behind on EV viability, foreign sales can still be sufficient to create a viable EV business. It would never have been a hard transition anyways, EV production would have been slowly built up while ICE production were ramped down accordingly, just as sales figures guide.