Kickstarter will be good idea if device will be interesting for all users.
Otherwise we can use forum.
We need to combine our power to develop something new and incredibly awesome.

The current N900 troubles are lack of developers and out of dated hardware. Despite that I am still using it.

We can solve the "lack of developers" problem by integrating android emulator. Also platform will be able to run desktop apps like maemo did.

To deal with hardware problem, we can make device upgradable.
Just like PC.

Also we need to brainstorm about futures. Just tell me what you want in this device, we will make a poll and decide what to add.