I would say the server market could easily adapt to Arm, Power or RISC. However I would concede it's very difficult to replace the desktop/laptop workstation. However Chromebooks are making great strives on this. Yes, they are still sending lots of data to Googles servers, but they do a lot of opensource work. Look at coreboot with depthcharge, which can give you a pretty free (not 100%) Arm notebook.