That's a similar nonsense as is the broad-scale surveilence to prevent terrorism. Botnets can already build a decentralized store of IP addresses, bypassing public DNS completely. Centralization makes some people, organizations or state just too much powerful.
Intelligent botnet authors will switch to the decentralized options once they are widely available and stable. While I think there's limited benefit to decentralization for any use case I care about, I don't think centralization is going to stop this trend in the medium term.
I don't think she has to. As long as your ISPs run GNS themselves, and offer you DNS via DHCP, then you can just forego the ISP DNS server and drop in your own local GNS. Mount .com and the other TLDs you want from direct from ISP off their pubkey, and overwrite the TLDs you don't care much for.