Yet another controversial topic that happens not only on this forum, but on most likely other forums as well. I've been here for a lil over two years, and I'm sure as heck ain't leaving anytime soon. I've been around plenty of forums, here and there, once or twice, and I've come down to this conclusion:
No matter where you go, no matter where you think you can go to hide, there will always be noobs. Even in real life there are noobs, you just don't realize it.
Unfortunately though, it is true when you say that most of the new people here aren't really that great with the English language, or grammar in general. But thank goodness for the few I've seen who actually show some promise here on NB or I would have been gone way back when. Also, with me being a sensei and all, I get to train the new generation on how to properly RP to the best of my ability, and even though some of them don't really show skill, I do see that some can actually understand what I'm trying to teach them. I try my best to deal with the new people as they come, but yes, some of them do get on my last nerve. But I don't let them get to me so much as it would drive me to complete madness.
If there's one thing that I can say about NB is that no matter how many people leave, NB will survive. A major example of this would be the RA coup that happened about eh, in the middle of last year. Then there's the longtime rival of NB, NS/AD, and even with these rivals and plenty of other forums out there, we remain. We shall not die easily. Just saying.