Symbian has served me well for the last few years. I have always found the OS to be intuitive, functional and versatile. Touchscreen devices have really changed consumer expectations in parts of the world, and Nokia has been slow to recognize this and make a shift in their OS. The market changes so quickly, it's hard to predict how consumers are going to feel a year from now.
I will admit the main draw to Nokia and Symbian for me was the fact that I could use an unlocked phone on At&t and get the cheapest unlimited data plan. It was saving me $20 per month. Now that at&t has changed that, I'm more open to other phones.
It will be hard for Nokia to compete at the higher end because the main competition can focus their resources on that market. Apple only has one phone they have to support. If they continue to offer a variety of form factors for a variety of markets, I think they will stay profitable in the future. The power users will be disappointed because the OS will not seem as polished or refined as IOS, google, or W7, but sometimes I think the power users are never satisfied. They will always want more out of their devices, and that's what makes this fun for them.