Indeed it's not going to happen anyway so it's all speculative but having a pool stuck in read only is a pain everything fails backups, databases , client's trying update there files basically anything that writes to the pool stops. In theory a hotswap would kick in once a missing/failed drive occurs and solve this of course this can be all done manually just leave an empty drive connected at all times remote in add the new drive remove the old drive and it's fixed albeit it's a bit of faffing around even more so when your 3000miles away