If there is a significant downturn in SACD releases it can easily be traced to the Classical labels which in past years released more SACDs than Pop, Rock, Jazz and world music COMBINED....currently opting to release their music via download vs physical disc.
But looking at Japan Tower Records' website, there are upcoming SACD titles available for pre-orders up until November 2021. Almost all classical music titles....and most of them are from the likes of Sony Classical, Warner Classics, Deutsche Grammophon, RCA Red Seal, etc.