I think the phone industry prefers a scenario of new models every year,
and 'old' perfectly good phones going into landfill..

ok.. they are making some token gestures to recycling...

But the basic principle I propose, is already in use by Amazon Prime
for customers with multiple Prime/Fire devices..

and software developers who permit installation on more than one computer at a time,
but require one to be uninstalled if adding an extra device over the limit..