It has been over 4 years since I wrote Wisper. In that time I have learned much.
Firstly, Wisper 2.x:
Wisper 2.x will continue to be supported indefinitely. This is quite possible because features will be frozen and since Wisper is a Ruby gem it only need work if Ruby itself contains breaking changes. This means there is no requirement, or motivation, to upgrade existing projects.
Gems which depend on Wisper, e.g. wisper-rspec, wisper-activejob etc. should depend on wisper 2.x, and a new version, 3.x, should be created to support wisper 3.x (even if there are no code changes). I would like to give the commit bit to other contributors to maintain these projects. Please get in touch if you are interested.