Vrbata had little to no value at this year's deadline.
Unlike last year where veteran defensemen could land you a 1st round pick (i.e. Sekera), the market was substantially different this year. At best, Hamhuis would've landed a 2nd+. However, given that Hamhuis publicly went on record saying that he wanted to stay in Vancouver and play out his career here, a red flag went up with other teams (i.e. Antoine Vermette part deux). Hence - his value became even lower. Dallas elected to go with Kris Russel, while Chicago went with Andrew Ladd.
Throwing away assets substantially below market value would've set a bad precedent......and would've given other GM's the message that Benning can be pressured into selling assets out of desperation. Instead, Benning stayed strong and decided that maintaining the culture of the team was more important than trading assets far below market value in the name of "rebuilding."
There is a lot more to rebuilding than simply trading vets for picks of any kind.