I think that he is referring to the tendency of GPU drivers to crash. Even if the DB is read-only from the GPUs' standpoint, if the DB goes down because of faulty drivers it's still a problem.
On the flip side, if this is sufficiently adopted, it could present motivation to driver developers, thus improved drivers. Perhaps this and the linux gaming movement could mean some symbiosis for driver development.
Ignoring Windows as I guess I don't really take Windows servers too seriously.
