All you can hope is that some day they are forced to support 3rd party apps because of some anti monopoly lawsuit telling them they have too.
I’m not sure if you are aware already but the reason Epic are announcing a million changes to their business is that the previous business plan was based around them successfully throwing a fortune at suing Apple to force them to support 3rd party apps and they tried and failed.
I think if it were ever going to happen that way, Epic would have succeeded.
That’s not to say it won’t still happen one day through political means. Seems plausible the EU might force it at some stage.