Indeed but we have computers now. Transaction costs are vastly different. The firm has changed remarkably little. Coase is not very predictive in these circumstances.
Transaction costs are psychological and informational rather than administrative. You can send messages instantly around the world, but that does not help you know what message to send.
It's certainly got easier to hire people for work fragments (mturk etc), but that only works if you can specify the work and verify its quality. This is the problem of "outsourcing" on a small scale.
