I appreciate the sentiment/argument, but that view doesn't maximize the probability to obtain either of the commodities the player seeks: 1) Cup, 2) $. (or reverse them - order is not important, not meant to be prioritized)
Moreover, a Buffalo-centric re-signing view assumes that compromise in both Cup-contention and salary is optimized in BUF and no other on-the-come NHL team.
If the player (Miller here, but insert any other NHL'er) wants a Cup, he'll sign lower on a team with greater probability than BUF to win asap. [Historically: Think Borque with COL, Hasek with DET,
(now a hopeful Iginla with BOS), etc.]
In short, I guess I think that Cup vs. $ compromise decision dilemna to sign in BUF is still a couple off-seasons away for any NHL'er (current Sabre or not). Although I think we'd agree I'd gladly be proven wrong.