Why do i feel he is dead wrong, the stability of a system in dependent on Kernel Writers more than the system builders. ARM would make it for a very important reason the electric bill, more and more Data-centers are geared towards saving on their electric bills to be highly profitable, many are already using renewable sources like Apple and Google. Also if he isnt willing to support ARM for Server-space some other kernel will make it. Also most X86 host these days run in Virtualised environment, there is no difference if it actually runs on x86 or ARM.
