One server will never be enough. You need redundancy in case of a fire. Don't forget to optimize kernels, load balance, ensure security patches get applied, etc

One server will never be enough. You need redundancy in case of a fire. Don't forget to optimize kernels, load balance, ensure security patches get applied, etc. I know I don't want that world, so I pay Google a measly amount to run App Engine for me and spin up new instances as my service needs them. I will be very surprised if the future is not bigger and better clouds.