Be glad we're not flying in India, where convention is to adopt the "international abbreviated callsign" for all aircraft...
VT-ABC, VT-BBC, VT-CBC, VT-DBC, and so on... twenty-six aircraft all with the callsign "Victor Bravo Charlie".
With the potential for 17,576 registrations, same as here, they manage to get away with only 676 callsigns to share around.