I am on the gold level, as I have been with Sprint for over ten years. That being said, from a marketing perspective, I think it would have been a better move to leave the premier setup as is, and then move the "gold" level to higher level. This would encourage people not only to stay with Sprint, but to stay longer or buy higher priced plans to move up again.
I like Sprint, but I think this was a mistake on their part. I agree with Redsoxfan in that there will be people who leave for this reason. If I was moved down to the silver level, it would not be a dealbreaker for me, but I can understand why people would change carriers.