The law (if it ever exists) should only apply to new iPhones and Apple should let users decide what they want.
Unlocking extra AppStores would likely also be more expensive than a locked in iPhone because of Apple’s ROI from the controlled AppStore. I don’t want to subsidize other people using a non-Apple controlled store when I know I wouldn’t.
As far as the subsidization again I'm not sure I follow, you're paying the subsidization today and the option to continue paying subsidization isn't what's changing.