Hi Marius, the period is probably not as popular as Napoleonic (Black Powder) or Roman Empire (Hail Caesar), but it has still has plenty of people playing it as evidenced by all of the different social media content I see. Warlord are still selling the Pike and Shotte rules, still have a pretty vast stock line for the period, and have brought out new products (for Thirty Years War) this year. I’m not familiar with the Japanese lines but they look to be available on the web store. I suspect that resellers have only so much ‘room’ and with Warlord bringing new lines out all of the time then older stuff probably falls off the edge, so to speak.
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