"What if it IS true?" - This tells me you haven't fully severed their mind control yet. Please don't be insulted. It took me years to do it. But once you do.......the stark realization is that it cannot possibly be true. To me, the notion of saying "what if they ARE right?" is on par with saying "what if water ISN'T made of hydrogen and water?" The possibility just does not exist.
It would take a miracle performed by a God I don't really even believe in. Even if they did away with shunning, and stopped lying, and stopped quoting people out of context, and stopped attacking those that disgree, stopped allowing people to die, stopped protecting pedophiles etc etc.......even IF all of this was done away with.......it doesn't change the fact that Jerusalem fell in 587BC....not 607. Therefore they cannot be the one and only true religion as they claim. To me.....this is no different than asking if you would JOIN Scientology if they got rid of all their bat shit crazy teachings. I doubt if you would because their foundation is still rotten. The same is true of the Watchtower.
Sadly your buddy is a classic victim of high control fear mongering.