The flip side of this is that watching someone as valuable as Toews walk in UFA, and having nothing to replace him, because there's not much left in the system. For a team gunning for Cups, that's going to be a massive hit to their chances going forward.
If the goal is multiple Cups, then there's a certain amount of logic in trading the extremely valuable Toews to make sure you retain some of that value longer term. Ideally, it would be for an affordable 2C with term, plus picks and prospects to balance the value difference. That would both fix a hole in the Avs roster for a few years, and replenish the prospect pool, while Byram would hopefully stay healthy and take over Toews role on the ice. Obviously, there's risk, but on the other hand, which NHL team isn't a small injury crisis away from being sunk?