Personally I love using desktop linux but the hardest hurdle to jump is ms office it is the default for pretty much everything in business and until open office and/or libre office can process these formats flawlessly adoption will be slow. However two big things are going for linux though that will make it more practical for desktop users the first one being the end of support of XP which will make it appealing for keeping grandma's computer secure without buying her new hardware and businesses will give it a look because it is cheaper. The other thing going for it is SteamOS which is bringing AAA games to linux and improving drivers. So the short answer is I do not know but i hope it is soon
Do you think Linux will take over windows place in the market
Nope.
I wanted to know this because I was thinking of starting to learn how to use Linux
You should do that no matter what.
Lolz, no, Windows is to small and limited to take over the crushing Linux operating system market share. You can't run the world on Windows, it's all linux.
Another problem is that Windows isn't the same as Linux, it's more of a software console, a consumer orientated locked down consumer app monetizing platform, while Linux is a full-blown operating system with all-encompassing hardware compatibility, enterprise grade solidity and reliability, open source quality, huge performance and scalability, Windows is just not in the same ballpark, they will never be able to touch the huge Linux market share.
Both operating systems have their merits. As such, I use both depending on what I am doing. I often run scripts for data processing from the terminal in Ubuntu, but still like to have Windows on the machine for gaming and using a few other software packages that don't have Linux distributions.
If you want to learn more about Linux, try setting up a live CD or usb version of Ubuntu or Linux Mint and see what you think. If you like it and really want to learn more you can then make a drive partition for it and go from there.