That's a really horrible advice which will probably end in breaking up
because i imagine it going like this "Omg you're so imatture"
2nd is that It's a male friend, just a normal friend >,>
Fun fact though : he's the one who got me into anime
I agree with what you say. But i think he can easily like VNs but he doesn't give it time. Because he thinks he can do other things. If only he takes a day off of everything and just read a VN the whole day(maybe exaggerating 5 hrs should be enough), i think that will help. But then again, i can't tell him to take the whole day off nor can i expect him to do it.
Easter vacation should be a good chance