Would Vista Cannibalise Microsoft Revenues

After much hype Vista was released in 2007 Jan. Now their is a talk in the circles about the very marketeability of Vista OS. As Vista requires a very high configuration PC to run to its full potential , most of the existing users will have to spend large amounts of money to either upgrade the hardware or buy a new system. Hense there is a fear in the industry that Vista may make users migrate to Linus which come in various variations and is also free and secure and supports old PC configurations. Let us wait and watch what happens.