Surface and Nokia
Microsoft should keep the Surface brand around, making slick black/silver products and keeping the same form factor for a long while. This will allow 3rd parties to create products to fit towards the surface devices (like the iPhone and iPad have many 3rd party devices). Making cases, docks, addons compatible with previous versions.
Some products they should make:
Making only 1 or two sizes of each device. Eventually they should slim them down and make them lighter.
NOKIA on the other hand should be geared towards consumers, focus more on Light, Thin, and Pretty. Don't need USB ports, or kickstands built in.
(It seems like Microsoft is moving toward this direction, I just think they should keep it this way)
Just a thought!