Why would they? Its the greatest gun ever created. Its a piece of metal with a piece of wood on it, and its the most powerful, most reliable automatic weapon created. Its so cheap to make and buy also.
I defenatly do aggree with you, because it's not only the #1 rated rifle, but it's also the most realible weapon of them all. You can bury it for 2 years, and then dig it up and it will still work like new! (I saw this on the weapons channel)
I think that would be ridiculous. I is one of the greatest guns ever created. The only reason i can think of for ever stopping it's production is if it becomes obsolete and they don't want to improve it.