Bishop for Honka would have to be the starting point but Dallas fans seem willing to pass on two years of Benn/Seguin prime by keeping the current goalie tandem in order to keep a prospect like Honka.
It's less about passing up two years and more about potentially signing Bishop for nothing but cap next season while still preserving our rare blue chip defensive prospect.
Dallas' blueline is still a massive issue. Trading away its future makes signing Bishop at that price a lateral move in more ways than one. Oduya will be gone after this season: Hamhuis the season after. Klingberg, Johns, Nemeth, Oleksiak, Jordie will follow in their footsteps...that's bad as it gets in this league. It's a really big deal to Dallas that their prospects (Honka, Lindell, and Backman in particular) make the jump with success.
This will allow them to play a cost effective defense before Seguin's extension. They also don't have forwards to trade for defensemen. Dallas' scoring depth is tied up in veterans (Sharp, Hemsky, Hudler, Eaves) and free agents. Needless to say, Nill has to be smarter than usual when it comes to trading futures. I hear fans make a potential trade for a goalie sound so open and shut and it simply isn't. Dallas played the part of an elite team with a woodchuck turd in net. They just need average goaltending to remain elite.