You can just look at the current state of meego to learn about its openess. Many people are alredy porting it to n900, to n8x0. to various beagleboards, to the google one, to various other dev boards ...

While only time will tell if these projects will have success. But a fact is that there is happening much more in public than happended with maemo5 (which was imho never ported to anything but the beaglebaord and even that stopped working after maemo5 alpha release).

Just get involved if you worry about all this.