No, there are no plans to retain sleeper service to Hokkaido.
Overnight trains of any kind are very much an endangered species in Japan: here’s the full list on Wikipedia. Once Cassiopeia and Hamanasu get the ax there will only be two (2) regular services left in the entire country, namely the Sunrise Izumo and Sunrise Seto services from Tokyo to Izumo and Takamatsu respectively. There are also a few irregular services that operate only during high season though, plus the odd superluxury cruiser like Seven Stars.
Credit:stackoverflow.com‘
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