The article reminded me about some very old article of writing oopses to a block device, like swap. At then the conclusion was that it isn't wise since a block device might be at stage of mayhem and there is data at stake. Still I find it appealing, that there could be a block driver for pstore and it is at sysadmin's choice to use it or not. The block driver could be configured to use a USB-storage or whatever storage auxiliary to data storage. I guess the main point is that the sysadmin is very very aware to place the pstore behind some other subsystem than the system's main storage.