> 1. New CEO decides to partner with Microsoft. Winphone requirements demand massive hardware reorientation
It's not a massive hardware reorientation. Remember that Nokia had one of the most diverse product lines in the world, and I can assure you that they weren't reliant on a single supplier.
Even when they were, yes that does take time to ramp up in terms of sourcing and logistics, but it has absolutely nothing to do with shutting down factories. Zip, zero. The plant tools don't care whether the chip came from TI or OMAP or Sharp or Toshiba or Samsung.
Yes, it does take time, but Nokia - for all its strategic faults recently - has long been praised as one of the best handlers of its supply chain and logistics in the world.