While me too I am disappointed by Nokia's lack of continuity, I wouldn't say I won't buy another Nokia ever again. My primary requirement is a mobile computer. I don't care much about the phone functionality - that's the easy part. What I want is a device for grown-ups (not teenagers)

• A display which is readable in bright sunlight
• A hardware heyboard
• Several days of battery life with moderate usage
• An open system, where I can become root (preferably linux)
• A handful (not millions!) of good applications, especially PIM applications

From that list my n810 gets 3.5 out of five points. PIM applications are the problem, but I am switching to emacs org-mode now, which should solve that too. And the system is not as open as it should be.

If some manufacturer can supply such a device I will buy it. But AFAICS all those Android devices and the iPhone do not deliver.