The Python 2-to-3 transition worked because Python is too big to fail. D has never reached that momentum. Rust is a more modern language in comparison to D and

The Python 2-to-3 transition worked because Python is too big to fail. D has never reached that momentum. Rust is a more modern language in comparison to D and the trend will continue without D3. Also the drama back to ~2009 was pretty bad and the community got hurt. Three of my colleagues wrote long programs in D but have abandoned the ship.