Changing from CC SUBs to WW spend is a good illustration of the way points collection is likely to go and why people are so negative.
WW spend is purchasing Qantas points at 1c/pt because each 1,000 points cost you $10 off your shop.
CC SUBs amount to purchasing Qantas points at ~0.4c/pt taking into the annual fee. A few years ago it was closer to 0.2c/pt — so the cost has already doubled pre-RBA changes.
And for $6,000 spend, you're earning 90K points with a card while you're earning, maybe, 3K to 10K points at WW (depending on the promotion at WW).
Put another way, you're paying 2.5x more for your points and earning 90% fewer points for the same spend.
When you take into account that, post devaluation, most people are unlikely to get much more than 1.5-2.5c/pt in value when they redeem their points and they have to deal with the challenges of award availability, lower status earn, etc, it is easy to see why the mood of the thread is that way it is.