Microsoft will back track and come out with a new strategy once this one fails.  It has happened before but it just is painful waiting it out.  People will have to be fired,  new people come in etc.  There will be some remnants left over that they will reuse in a new strategy.  Right now, I would just stick with Windows 7 since it will probably exist for quite awhile.   Some of the good stuff in Windows 8 will roll into Windows 7 as a service pack.  I dont have a big problem with Metro for a new device such as a touch pad but not for laptops/pcs .