Dunno if you are being serious or not, assuming you are for the sake of discussion.
Nokia isn't coming back
I wouldn't be so sure about that.
MS did not buy Nokia (despite headlines from people who thought the most publicaly visible part of a company was the only part), they bought Nokia's handset division, the lumia brand, some time limited rights to use the Nokia brand, and some time-limited no-compete clauses preventing Nokia from using their own brand on handsets for a while. In the not too distant future Nokia will be free to start a new handset division or license their brand to someone else.
Microsoft can rest easy now, the threat to Windows Phone has been eliminated.
Somewhat true, having first party handsets means they can keep offering phones even if the rest of the industry thinks their OS is a bad idea and some goodwill will have transferred from nokia to MS through the lumia brand and their distribution agreements but it's a very expensive way to maintain a distant third in the smartphone OS marketplace.