This is wrong at so many levels it's hard to know where to begin.
I recommend you drop in on LXer for Linux and open source news. A fortnight of keeping up to date there will lay waste any fears that Linux is 'a no hoper.'
As far as servers go… yes, Linux totally dominates the supercomputer market but it also dominates the server market, mobile devices and Linux even powers Android. (That last one might be changing, mind. It's a bit unclear with mixed messages from Google.)
Open source software development is fast become the de facto standard for industry because it allows development at a fast rate than all in house propitiatory coding and greater use and re-use of existing code. And it means no nasty backdoors so clients can trust your code.
The only place where Linux does not dominate is the office/home desktop. But even there things are changing and in ways you might not expect.
a) It is very hard to get exact numbers of the use of Linux on the desktop. I am suspicious of the oft cited 1.5% figure and contend it is vastly under estimating Linux use. Governments are now jumping to Linux and open source in general. China has produced it's own Linux distro that mirrors Windows XP. Thee are numerous other examples. A lot of countries are distrustful of Microsoft after their data slurping and pandering to the NSA and CIA. Where are they going? Open source and Linux.
b) Regardless, the future of the desktop is Linux. How? One word:
I will explain as succinctly as I can.
ARM chips - not relying on Intel's legacy x86 instruction codes, can compile to absolute native code. Intel cannot because, although Intel translates the x86 op-codes into RISC instructions, the old X86 code which Windows and office apps use must be maintained, adding a layer of complexity which leads to slowing down the chip delivery which leads to heat and high power drain.
Intel have clawed back some efficiency in their chips but they cannot get past the x86 code barrier. But ARM has no such legacy concerns. The mobile market is now dominated by ARM and mobile devices are morphing into hybrids.
But, more, there is the Raspberry Pi! The Pi and it's numerous clones has quietly shaken the computing world. Intel chips have failed to get a hold in this new and up and coming market and Microsoft have had to abandon trying to get the bloated Windows to run on ARM based Pi's. Nobody wanted it.
What do Pi computers run? Well, there are options but generally… Linux.
A whole generation is growing up now with Linux as the OS and development platform at school and these little machines are getting faster and more powerful. Plus, these little machines can deliver faster throughput on the same clock rating on much less wattage than an x86 chip running Windows. The only reason Intel and Microsoft are dominant in the desktop market is legacy. Up until recently - you wanted an office suite? It had to be Microsoft office. This is starting to crack.
Example: I will be joining my wife in running her business at home next year - papers permitting. We will be 100% Linux. Saves us a fortune and we have no legacy obligations to Microsoft. Once company has chosen an OS and software they are pretty tightly stuck with it and, frankly, there wasn't really a choice until recently. I contend that it was only around 2010 that Linux really became usable for the average Joe… but now it's here to stay! So, we are business that has no Microsoft code running.
If we can do that on x86 boxes, what will happen with the rise of Pi?
I content that with mobile devices becoming hybrids, smartphones becoming full plug Linux machines and Raspberry Pi's growing inch by inch to become desktops… Windows is eventually going to squeezed into a niche, largely legacy market.
As it is, Linux dominates on super computer, servers, mobile devices (sans IOS; maybe) and even embedded devices and prototyping via the Raspberry P. And that's for now, leave alone the future, Microsoft and Intel are both tied to legacy x86 code and it's inherent problems are now biting it.
The future is open source and Linux.