That said, I understand why they are doing it. It doesn't make sense whatsoever to receive one time payment and provide updates forever. Also, despite that people claim that they want "one time payment apps" that doesn't seem to be the case at all. Very small number of people actually pay in full for the apps.
What's worse than subscriptions is ad-ridden apps. I love hyper casual games for example but I can get no joy from these anymore because they are overflown with ads, the experience turns into torture. I don't want the ad based model to be the answer too.
Maybe there could be other models like trial purchase where you get an old school trial version and pay to continue using it. I think actually there's nothing stopping you to implement this but it doesn't solve the problem of need for continued payments for continued support. Maybe the AppStores can implement something like version limiting and you can ask for a payment for upgrading to the new version.
In the grand scheme of things, the subscription model is the best option at this time. People say that subscriptions are devils act but that's also how viable businesses are created.