Changes like this can really make overseas-based frequent flyer programs much less appealing.
Skywards already recently lost all of its Citibank transfers (which included not just Citi Rewards, but also Suncorp Rewards, Diners Club Rewards and a couple of others). Add to that, having a conversion rate from AMEX that'll be the least appealing of the Big Three Middle Eastern airlines (with MR to Etihad and Qatar being 2:1), and the only other card partner being CBA where the conversion rate is already terrible. With the super high carrier charges to redeem on Emirates, it makes the whole loyalty prospect on Emirates rather 'pointless' for most points-collecting Aussies.
Then, with SQ... the whole appeal of SQ used to be better redemption rates paired with better availability. Then the redemption rates kept creeping up and up, to the point that they're basically on par with Qantas and Velocity. (Sure, there are sweet spots in some cases, but often the number of miles needed is comparable for the flights I'd often book.) So, when you consider that KrisFlyer miles are now harder to earn - especially given the devaluation announced just a few days ago with Amplify Rewards - but the redemption rates aren't significantly better, it also falls closer to the 'why bother' pile. It still has the advantage of no carrier charges on SQ reward bookings, versus what you pay redeeming through Velocity, but most partner airline bookings have extremely high fees (e.g. a Lufthansa domestic flight can run up to $200 just in co-pay fees, on top of the high number of miles needed). So, I'm leaning towards transferring just enough to KrisFlyer for what I'd need for one more reward flight, and then probably disengaging from the program.