That is the $64,000.00 question.
According to Waves they won't stop working (and they never have in the past even if users were not on WUP). They also say if you are on WUP you will get updates (to V14 only, or so it looks like) until your current WUP period is over.
What is unclear (to me) is if they will give me V15 if it comes out before 25, Jan 2025 (when my current WUP is over). Only time will tell. I'm not holding my breath until then though.