WiFi already manages this. Systems set up like eduroam have a student sign in to their university WiFi one time and have access to WiFi across their campus and all other universities that support eduroam.
There are also commercial options. ISPs offer a similar service where you enable your home router to broadcast a ISP connection point alongside your normal WiFi access point. This enables you to join any other ISP connection point where ever you go.
The issue with this is control. You would have to give up control of your access point to the centralised system. So your internet access may be limited by other people using your line.
WiFi already manages this. Systems set up like eduroam have a student sign in to their university WiFi one time and have access to WiFi across their campus and all other universities that support eduroam.
There are also commercial options. ISPs offer a similar service where you enable your home router to broadcast a ISP connection point alongside your normal WiFi access point. This enables you to join any other ISP connection point where ever you go.
The issue with this is control. You would have to give up control of your access point to the centralised system. So your internet access may be limited by other people using your line.