MS doesn't have to "redesign" anything. Right now, they've got so much bad press between their online nanny checks, DRM policies, always on Kinect, regulated/limited used game transactions that Sony's decision to make online play a part of paid PSN+ seem like minor news in comparison.
But, MS can take a hit on each unit sold by matching price (and they will take a hit because of Kinect), including a year of XBLG with every SKU (not just pre-orders), loosening up the restrictions on used game sales or the online checks (no bricking of games until you log back in for instance), etc. and the only restriction you're left with is having to use Kinect, which is presumably built into the way the console functions, which is not to say that there isn't a workaround for those who really don't like webcams.
That's their worst case scenario. In all likelihood, they're willing to concede the first year of sales to the PS4 until their larger, long term plan comes into play (which is not to say that it will be any more of a success), and will not budge on any of their poorly received policies. If you don't like it, you can buy an Xbox 360 type responses.