We've been down this road before.
End user pricing, probably, won't be affected by changes in the commission structure. A dev who charges .99 and gives Apple 30%/15% will still charge .99 even if Apple's commission was $0. Does one really believe the dev will reduce the price to .79?
Are you sure you have skin in the game? If you had you would know this:
The Dev does not charge anything. The App Store does, check your App Store billing. The App Store pays the dev 70% of the end price.
Here is how things actually work. Say you, the dev wants to receive 70 cents for the app, let call the suppliers price. You feel that the app is worth it, it fits your business model bla bla bla.
So what the dev does some basic maths: 70/0.7 = 100 cents. Check Apple price tables and voila, the thing closer to that is 99 cents, select. You get ~70 cents and the App Store gets ~30 cents. That is the end price.
If Apple decided to charge say 40%.
70/0.6=144 cents. Do a lookup again on Apple price look up tables, find somthing close, either you go for .99 or 1.99. If you go for 99 Apple is eating your lunch. Don’t want that of course, you go 1.99. You get more than you thought, Apple gets less, customers pay more.
Now say %15 commission.
70/0.85=82.4 cents. Do a look up again, .99. Ok select. Apple gets less with its reduced fee, the dev gets more … customer pay more than you thought initially.
So in the end of the say in this 3 scenarios, in rounded numbers:
1) Customer payes 30 cents to be able to install and update the App
2) 57.7 cents
3) 15 cents
In all cases of course it affects the end price.
We are talking one off. Now subscriptions … consider this values every month only to be able to install and update the App. Wether customers are paying to watch Netflix videos, or buying an eBook.
Simple.
Cheers.
PS: The higher the supplier price, the more you pay to be able to download and update the app. Its indeed very simple.