When user login on console, check network connection. If system is connected to
network, do nothing (maybe show welcome screen, similar to this is GUI?). If
system is not connect to internet, check nmtui is installed. If not, do nothing
or search other tool. If some tool to connect to internet is installed, suggest
user to use it. Example:

You do not have network connection, but nmtui is present. Type nmtui and
configure network connection, if you like.

I think, it is too simple feature request, I could implement it.