The people that are most concerned about that are coders. Coders, even in the linux world, still makes up a small percentage of end users (although it being percentage wise greater then windows). The majority of end users simply want stuff to work, and still to this day Nvidia's blob offers the best end user experience in linux. If you want FOSS drivers for nvidia, the way to get it is simple, have a competitor not only match Nvidia's performance but exceed it enough that it starts taking over Nvidia's reputation as the best performing card for linux.
On the other hand, the issue that we are discussing here is not associated in an obvious way with any direct costs to ASUS other than just contacting nVidia with the FOSS driver request. Both companies could have gained better Linux-users' attitude if ASUS managed to bring the request to nVidia's attention and the latter responded.