There’s some DHT-based DID methods so it’s possible - one of the nice things about the DID abstraction layer is that could be added.

As I understand, atproto is intentionally limiting to PLC and Web for now, and monitoring the ecosystem. Every method has to be implemented by every client, so you naturally want to be cautious in how many you support.

(I don’t work for or represent Bluesky, so can’t speak to any plans other than what they’ve stated publicly!)