I'm sure folks would line-up and say 'if it ain't broke' about original BF, Modi, etc. Hell - even the Model T car. Where would we be if that was the only time folks introduced new products with new advancements? Besides, what makes one think Gungnir 2 would not be better? It's the circle of life. IIRC, it was stated before that Schiit will keep Yggy in play as long as they can to protect the investment made by folks that bought Yggy. AKAIK, no such thing has been stated about Gungnir.
A Gungnir 2 release ain't just about whether it's broke -- sales plays a big factor. I suspect that many, many folks that were contemplating Gungnir in the past are buying BF2 or passing over Gungnir and going to Yggy. If I had to guess (and it is a guess), Gungnir sales are lackluster in comparison to the other 2 and nowhere near what it used to be. I would much rather there be a new Gungnir than having it dropped from the line-up leaving nothing between BF2 and Yggy.
Anyhow -- what I have to say about it doesn't matter. I'm just speculating. The decision lies with Mike and Jason.