Just curious, why all the anxiety over the WUP? Is it really necessary that you purchase an update plan after your 'free' year of updates expires? Why not just take a pass?
In all the years I've been buying plugins, I don't recall even one that became incompatible with the DAWs I use (the obvious exception was the transition from 32 to 64 bits).
Has it been the case that Waves plugins in particular become incompatible over time? If not, I'll just continue using my current plugins without paying for the WUP.