Nah, it won't mean a thing. Microsoft still has almost 60% of the desktop browser market share.
http://www.netmarketshare.com/browser-market-share.aspx?qpri...
Unfortunately, they have no mobile market share, and this is where most people will be browsing the web.
http://9to5mac.com/2015/02/24/ios-android-duopoly-marketshar...