Killed, in the sense of no one ever migrated? Certainly not. Killed, in the sense of hugely impacting the eco system and the community? Quite regularly. Python

Killed, in the sense of no one ever migrated? Certainly not. Killed, in the sense of hugely impacting the eco system and the community? Quite regularly. Python seems to finally mostly have made the transition, but there is just a lot of software around which will never be ported to Python 3. Perl almost completely went away, until finally development of Perl 5 gained some traction, but also with promises of maintaining compatibility.