Instead of making the N9, Nokia should've simply sold the Samsung Galaxy S (2010) phone.

They could've saved a lot of time and money not doing the hardware.
They should've just focused on the software.

In fact, if the MeeGo (not Harmattan/Maemo6) was completed and shipping by Dec 2010... Nokia would've become a high profit company.

Android and iOS really took off with the SGS and iPhone 4.
A decent competitor then would've created a healthy third wheel.

In fact, if WP8 was released initially (WP7 were beta tests) it would've gained a lot more traction, especially on devices like the HD7 and Arrive.