The only thing I would say is that medics have tools to reduce that distance that the other classes don't have as well as the ability to heal all the time. I feel if I had more range the class would be OP.
The medic class had ranged weapons in the last 3 games and the class was never "OP". It has limits just like the other classes. If Medic stays the way it is then the class is slowly going to die off in terms of number of players playing it. Nobody wants to be the weakest class in the game and lose to other classes at all ranges. Thats just not a fun way to play.
Luckily I think LC is right when he says that whats likely going to happen in in future updates they will introduce a carbine for the Medic class. The only problem is like he says we will end up having to wait for that to happen.