I doubt the average consumer cares about Nokia one bit, heck I don't and I follow the smartphone market pretty closely. 
The problem is it isn't 2009 anymore, the smartphone market has two major players that are growing at the expense of everyone else. Plus it's not the fact that WP7 is selling slowly but it isn't even selling enough to stop Microsoft's market share from continuing to fall.
Come to think of it I can't even remember seeing a single WP7 device in the wild and I've never heard anyone mention wanting one either.
		
		
	 
Well, that's the thing - Nokia isn't selling well with people that follow gadget news, but they still sell hordes of phones to the average consumer.
In 2009, Apple was the rising star, Blackberry was still king in the US, Microsoft still had a sizable foothold. You could have spun it to be just as unthinkable for Android to do what they've done in the last two years. Before the Droid came out, I didn't know a single person with another Android device, despite the fact that I'd sung the praises of my G1 since I got it on launch day.
The smartphone market is fickle. Not only do people replace their devices fairly frequently, by the time they do, they're usually pretty disgruntled with their current device, due to how fast the technology improves. One company being on top today does not mean they'll be on top tomorrow.
People use the whole "but they've bought apps!" argument against that, but it hasn't held up. People might buy a few $0.99 apps, occasionally something more expensive, but that's not going to prevent someone from shifting platforms.
Obviously Android is in a good place, and Microsoft has work to do, but its quite foolish to assume that a company will be on top tomorrow solely because they're on top today.