Well, although the 1N5711 has been on the market since 2001 and still is active as @Andrew Neil mentioned, it will continue to be produced as long as there is demand. It is not foreseeable that this demand will diminish in the near future, but no guarantee can be given for a minimum longevity.
My personal opinion: you will still be able to buy the 1N5711 the next 15 years.
Good luck!
Regards
/Peter
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