They don't even need to take all the VPNs: as the Chinese government censors have shown in their dealings with Apple, a well-provisioned national firewall can be made compatible with VPNs, simply by requiring VPNs to share their keys with national censors, allowing for surveillance of VPN users. VPNs that aren't surveillance-friendly are blocked at the national firewall.
In 2015, the entertainment companies convinced Australia to swallow a fly, and insisted that would be the end of it, no spiders required. Now they're asking the country to swallow just a little spider to eat the fly, and assuring us there will be no bird to follow. The bird will come, and then the cat, the dog and so on -- we know how that one ends.