The Osborne effect for languages. Now there's no risk in announcing version 7 since effectively everyone who was going to choose Perl already chose Python (or Javascript).
There's also the Ozzy Osbourne effect for programming languages:
I've listened to preachers
I've listened to fools
I've watched all the dropouts
Who make their own rules
One person conditioned to rule and control
The media sells it and you live the role
Mental wounds still screaming
Driving me insane
I'm going off the rails on a crazy train
I'm going off the rails on a crazy train
https://en.wikipedia.org/wiki/Osborne_effect