That's quite a big "just" Dick. There are quite a few more "justs" along the way......
Our sectors and controller numbers are arranged to provide "just" the service we do. We'll "just" have to simulate the extra workload and "just" have to simulate new sector boundaries before we "just " train controllers and "just" recruit and "just" train the extras required.
We "just" need the resources to do it. We don't have any extra space to "just" open however many new sectors it will require.
Anyone who tells you that separating traffic is easier than "just" giving traffic is blowing smoke, has never worked procedural airspace or you're "just" hearing what you want to. Most of the time giving traffic is far easier when there's no surveillance coverage - you give the traffic and that's it because you can't see anything else.