I think u either use windows or Linux or any other OS it will take time for getting used to it . If u tell a person who has never used a comp before, it will take him the same time to get used to any of the OS which ever he chooses.

The bottom line is alot of people are used to windows and they do not want to waste there time getting used to linux [But hell they will have to do it in the near future when Microsoft starts fining every individual for using Illegal copy ]