I am choosing to stay within the App Store. No guarantee of recourse if something goes wrong when circumventing the ecosystem.
The beauty of having a competititive market is that you're totally free to do just that. If many customers would rather pay more to do all the transactions through Apple then everyone is happy. All this will do is allow developers to cut out more middlemen out of the transactions.
Obviously this means Apple needs to rethink their model a little bit, they may end up splitting the developer plans into two, one where the developers agree to an additional requirement that they will use only Apple IAP, and one where they don't. The second of these two plans will likely involve fees for Apple cloud network bandwidth associated with the app, other fees like app review, perhaps optional marketing packages, etc.
I guess it's possible Apple will no longer legally have the option to make that requirement, due to the lawsuit, in which case I have no idea how I would expect them to change their fee structures.
My stance on all of this is that there should be regulations regarding the sale of devices capable of running user installable software. If your intention is to make such a device, then you must provide a way for users to install their own software on them. It doesn't have to be easy, but it must be doable completely offline, without interaction with the device manufacturer for things like code signing certificates. And yes, I believe this should also apply to gaming consoles. That way whatever becomes the most popular marketplace on such devices is playing fairly. I think it's fair to allow the manufacturer to pre-load their own app marketplace for that, that's their perk for building the device. Dictating what software runs on the device is not a perk that device manufacturers should be allowed in my opinion, unless it's ONLY that software, then it becomes a different class of device.
I think this ruling is great, but I don't think it goes far enough, I will consider Apple completely fair when they allow sideloading. I will continue to use their App Store anyway for pretty much everything except open source software which I think will then be distributed through something similar to Androids F-Droid marketplace, but at that point in time we will know that the free market can actually do its thing with regards to ensuring the fee structures are fair.