Not trying to start an argument here but I do want to point out that your argument foundations on blaming other competitors instead of looking at what can make the platform you're passionate about more palatable.
There are many, MANY, reasons people will choose Mac and windows on their own accord.
Your argument hand waves that away to make a boogieman out of mac and windows, and erodes the true viability of Linux as a platform by not looking at how it can improve, and instead focusing on how the competition "is bad".
Taking the ego stance that Linux "would be great if it wasn't being held back by the bad guys" doesn't actually help Linux desktop adoption...