The vast majority of games need to run on consoles to be financially viable, anything that requires an entire second GPU is a complete non-starter. The only way it's going to work is if the models get small enough to run on a negligible slice of GPU or CPU time, with a reasonable memory footprint (<1GB), on whatever the current console hardware happens to be.

I see your point, but it hasn't really stopped novel features from coming to PC in the past. The PC market is about 50% larger than the console market too.

Console manufacturers would salivate at the thought of new hardware that makes people want to buy a new console instead of playing the ones they've already got. Once someone gets it working reasonably on PC, it will quickly spread to a new generation of consoles with new hardware that makes people want to upgrade.