IIRC, Google plans to release all of Android as open source under the Apache license once the first Android based phones start shipping. After that I don't see any insurmountable technical reasons why someone couldn't hack up an Android runtime that could work to some extent on the tablets along with Maemo. There would be technical issues to overcome of course, but the N8x0 definitely has the CPU power for it and if the demand and source code is there I think someone will step forward.

-John