I don't think Nokia should. Sure, they can probably gather 10% of the American market, that's approximately 1.8 million out of the 180 million or so at the moment going by cellphone subscribers numbers only and not growth or potential, if they put their minds to it... but why do it?

Nokia has shown that they don't need the US market. So why start now? I personally do not think they should.

Find that 10% loss of global market elsewhere.