Well, it is not software developers that won't be needed anymore. It is large corporations. If a small team of developers can make huge projects. There is no reason for them to work for a large business.
With the advent of generative AI the painting has been on the wall for some time. Using it in Photoshop is simply so good that it is a necessity by now. Affinity are not a large enough company to train an AI, and any AI will not be able to run locally for a long time. So it must take place in the cloud and therefore require a subscription.