I highly doubt there will be any win for consumers. App developers probably aren't going to reduce their prices by 20%
Lowering prices increases the number of jobs available, and the only cost is that Apple loses some amount of it's astronomical profits.
I would absolutely take all the savings from the fee drop and hire as many people as it allowed, napkin calculations says that’s between four and five for me.
In all likely hood things will get worse for consumers. I will definite not buy apps requiring custom payment platforms. Hopefully it’ll settle on stripe companies will offer multiple payment methods rather than trying to force their own.
I look forward to it making Apple lower its IAP fees for everyone. I’d still like to use their infrastructure, but without the enormous fees (15% for small devs is still huge).