The difference being that networks and Netflix servers don't cost a lot of money or take up space when they're idling, and/or they can sell the capacity and switch rapidly when they need it, whereas hospital capacity does.

I mean I'm all for having excess hospital capacity (and excess capacity for a lot of things), but at the same time who is going to pay for it?

This has been the problem before cloud computing; companies had to set up servers and the like for the worst case peak capacity workload, meaning that usually they'd only be operating at 10-20% of capacity.