What holds Linux back
Source: AnandTech
Make it easier, faster, prettier, and write more applications and drivers, of course...
"Linux has come a long, long way since it was first brought to the scene. It has gained a huge level of support in the community and has garnered a well deserved reputation for stability and flexibility. Consider that you can have some of the best distributions for the price of a download, with no licensing fees or use restrictions to speak of, and you have the makings of a sure-fire winner. In fact, there is so much potential here it is almost unfathomable."