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Crazy idea: the UseByDate[Y, M, D] implicit. If you don't want to support your API for more than a year, require implicit evidence of UseByDate[2018, 12, 16]. Needs SIP-23. A macro autogenerates instances up to specified date. Implementation is left as an exercise for the reader.
A more aggressive version could add warnings and increasing Thread.sleeps at compile time as the expiry date approaches.
Why not have it delete the offending source code?
This sure will be a great feature. GHC did this back in the time and it was received gloriously by the community 
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