The legislation would require Google/Apple to "step aside" and allow side-loading/alternative app stores, so yes?
Google and Apple would still be welcome to operate their own stores. A 3rd-party cross-platform store would compete with them, hence no monopoly.
Edit: I guess you read my comment to mean "Apple's app store would come to Android" or vice versa? That's a possibility. I'd prefer that to the current state of affairs where no direct competition is possible