So a few observations...
First, there is more to a computer than the latest and greatest specs. Apple has proven time and time again that it can do more with lesser hardware. Changes to OS X have made older hardware performant. Remember just because something has the latest processor, memory, etc... doesn't make it the best overall computer.
Second, people are going to choose a computer based on 1) operating system 2) price 3) specs. That means people who want a Mac, are going to buy a Mac. People who are shopping based on price are likely to buy a crap Windows laptop or Chromebook. Only professionals may make a choice to switch to Windows. But are you willing to completely change your hardware platform based on something coming in a few months? Maybe. But doubtful.
Third, if you all can't wait a year to purchase a new computer based on what's coming next, then either just wait for what's coming next, or purchase the best product today. Sounds like this forum is filled with Android fanboys who shop solely on specs that are meaningless.
Fourth, marketshare. Really? So you do realize that Apple still has barely been pushed to fifth place while still selling products with ASP that are twice as high as their competitors? You also realize that this list completely disregards iPads as computers even through Windows machines that are tablets are considered in the list? If you were to add iPads, Apple would be #1... but they won't do that of course. It wouldn't paint the picture their clients want.
Just once again, an "Apple is doomed" prediction. Per protocol and expectation, Apple will release a new line of Macbook Pros soon and the tech world will be awed by the performance and new features that they will struggle to copy while the pundits complain about how Apple has shunned the past and forged ahead into the future... only for the whole industry to follow suit and copy them.
Just wait for it...