Everything depends upon the results of the appeals.
If Apple's appeals fail, what we are seeing now becomes the new status quo and the story basically ends here. Epic wins. Apple could possibly raise hardware and/or developer account prices in response, but there's just nothing meaningful that they can do about it, once the appeals have run out.
If Apple's appeals succeed, the popcorn continues to flow and the story goes on for awhile longer. For starters, I believe we should indeed expect Apple to revoke Epic Sweden's ability to publish to the US App Store, as Apple will view any profits made by Epic (and/or their Swedish subsidiary) which did not include a payout to Apple as ill-gotten-earnings. In line with that, we can also expect a countersuit from Apple for recompence from Epic against those earnings.
Keep in mind of course that both companies are multi-billion-dollar juggernauts in their respective realms of influence, and that the earnings that Epic stands to gain from Fortnite returning to Apple's platforms will continue to be dwarfed by their earnings on other platforms: whatever amount Apple claims against Epic will likely seem absolutely staggering to us mere onlookers, but it'll still be effectively pocket change to the two of them. What's more, if it starts to look like Apple is going to ultimately win... Epic will absolutely settle out of court as quietly as possible, and the terms of that settlement will never see the light of day.
In the final analysis? Either way, Fortnite will almost certainly be back on the App Store, at the end. So is it worth it? Or does it, as you assert, simply serve no purpose?
To which, I will reiterate: as I've
stated before, this is a battle between two juggernauts over
minor annoyances introduced by the other, wherein each perceives the
other's business model as adversely affecting their own business model... and neither cares in the least about who else gets hurt while their battle rages. It's just
Randolph and Mortimer all over again -- except that, unfortunately, I'm pretty sure that Murphy's and Aykroyd's titular characters were left out of the story, this time around. More's the pity.