Of course not. But you take those patents off the table. It's 7,000 fewer patents you have to deal with. Even under reasonable terms, if MS gets enough patents, they could raise licensing fees such that doing WP over Android is a no-brainer. Now the Android licensing fees are just a nuisance.
Also are you actually suggesting that producing IP is more efficient and quicker than buying it?!
Yes (well cheaper -- not quicker). At least buying targeted patents. These large portfolios are going for about $500k-$750k per patent. I wouldn't be surprised if Google paid $1M each for the 1,000 IBM patents they bought.
The big advantage they get w/ buying is the patents are available now. But this is why this is a firing offense. Everyone else in the industry has been building up their IP warchest for some time. Apple telegraphed it years ago that they'd fight with patents in the mobile space. Google seems to be surprised.