As someone who enjoyed the Diamondback ERT quite a bit last year, I can honestly say I'm very disappointed that it may not continue in 2011. I agree that while adding WindSeeker makes sense from a marketing standpoint, I could care less about another tall flat ride and wouldn't come to the park early just to ride it and Vortex.
Beast and Diamondback are two of my favorite rides anywhere, and there were a lot of days last year where my daughter and I would come over, ride those in the morning and be back home by 11 AM. It was a perfect way to start the day. I hope they rethink this decision, and since we haven't renewed our passes yet, maybe I'll wait a little and see what happens.