When they discontinued the line in 2021, they explicitly mentioned they would maintain support of the SoundTouch app. I have a Wave IV and thankfully didn't buy into the multi-room playback system, so at least the radio, CD player, and airplay will still work. Except I primarily used it as an alarm clock with a streaming service, so this really sucks.
They gave a consolation prize of 25% off on some Bose speakers, but why would you want more Bose speakers if you can't trust them to keep their word?