You can already do that with VPNs. Businesses already heavily leverage them, and consumers are generally not interested in the hassle. You'd also have to be careful with the implementation. If one computer can be connected to both networks (and it sounds like they'd almost have to be), hackers will bounce their connections of someone else's computer. C&C traffic comes in via the insecure connection and out via the secure connection.

It would probably hamper script kiddies, but it's not going to do much in the face of a targeted attack. And even a semi-motivated script kiddie could probably buy a service from a botnet to route their traffic onto the secure network.

The idea that an "ID-required" network would do anything to slow down bad actors is downright hilarious.

im sure chinese would agree

Not sure why you think the way China does it has to be the only way it can be done. It's exactly like shouting "COMMUNISM!!!!" at every social policy idea. Get a grip.