I'd say there's a 30% chance Necas is moved this offseason. Unlikely, but definitely possible. That probably only happens if he wants too high of a salary. I'd imagine the Canes would do anything under $7M. It's hard to justify giving him $8M or anything as he just doesn't have a long enough track record as a high scorer, and tends to play worse in the playoffs. Svechnikov is more important to the team and gets $7.75M caphit through his prime. Necas is also not strong defensively (nor is Svechnikov, for the record).
I think $6.5M is probably a fair offer with some term, but recent cap inflation might make that a low offer.
If he asks for too much, the Canes would prefer to move him for a young player rather than a 1st. Unless that first is in the top 10, it's probably not worth it for a developed player like Necas. If the best offer we get is around a #27 overall, for example, I'd rather just overpay or punt and do a 1-2 year deal for Necas. Also we won't trade Necas for a rental, that's ridiculous.