If no one is accepting Monero in your country, city, or neighborhood, then the fair price is zero.
Closing down fiat ramps is just one thing that regulators might try. Next step would be banning Monero wallets from app stores, or marking Monero as malware or state sanctioned software. Who would want to use Monero then, when the UX is worse than paper cash? People buying drugs can use Venmo and say that they're buying art commissions or something like that. Or exchange gift cars by mail.