As someone who buys a lot of apps this is very disappointing. Things that would make me buy MORE apps (demos, upgrade pricing, better support) are still not in the app store, meanwhile the one pricing model I detest (subscriptions) is being added. I suspect I'll be buying far fewer apps if there's a mass movement from a purchase model to a subscription model among app developers. I'm perfectly happy to pay $20-30 for…
I think the mindset change that needs to happen is this: Apps are a service. I would actually prefer to pay developers of apps that are truly useful to me a monthly amount so I know they can continue to update and improve the app. If an app saves me $1000/yr in headache, I'd prefer to spend $30/yr on a subscription rather than lose the app entirely because the developers can't keep the lights on.
There are other games that I play all the time where I'd be happy to pay a bit every mo/yr to ensure content/fixes keep flowing.