You also toss out with the bathwater virtual machines. You can boot a virtual machine where the hypervisor is 'signed' on a machine which gives you 100% access to your virtual machine that can do most anything you might want, from talking to the network, to displaying graphics, to running the latest fizzbuzz contender.
My guess is that wmf's is correct, the relatively low volume of 'general purpose' computers will cause the cost to rise but I doubt it will ever be impossible to put one together.