The Ice Breaker being sold by Xur is not going to cause a nerf. If that was the case it would have been nerfed after the first time he sold it. I give it a month after the House of Wolves DLC. After that watch this forum and the game itself decline in numbers. What is it 5 maybe 6 months after the HoW until they release the next expansion pass? There's no way people will continue playing this game knowing that nothing new is coming for quite some time. Especially seeing how the content department is severely lacking.