UDI
All the key gTLDs need to do is declare UDI and set up a new directorate.
They'd need to "steal" the .com and other non gTLD databases. But ICANN has "stolen" the new TLDs for itself anyway.
Personally, I think it is time for the balkanisation of DNS anyway. The whole system is corrupt and abused. From here-today-gone-tomorrow fraudulent domains, through to the ransoming of domain names and domain squatters.