This is already happening and the best game I have seen that incorporated Blockchain technology has to be :

https://www.augmentorsgame.com/  This game got some good exposure when it was pitched to some investors in the

reality series, Shark Tank. A lot of games does not use Bitcoin directly, but you can buy tokens with bitcoins to upgrade

your character and to improve your game. I expect a huge increase in in-game Bitcoin based games, when the Lightning

Network becomes more mainstream. The Lightning Network will make micro transactions cheaper and faster and that is

what these game developers are looking for at the moment. 

Bitcoin can be used as a payment system to purchase all goods on the Internet. But it seems to me that bitcoin has now become a significant brake for the gaming industry. Miners swallowed up all the stocks of the GPU. At the same time, the price of GPU is so high that it is impossible to buy them for non-commercial purposes. I think that this situation significantly reduces the demand for computer games.

I believe in the year 2016, there's already an online games that can be purchased through bitcoin. It's Valve that has partnered with Bitcoin payment. Kindly check this link for further information.

https://www.theverge.com/2016/4/28/11525482/bitcoin-steam-valve-bitpay

I am a gamer too and I think it is best if the cryptocurrency will be used as a payment in an online games. I hope there is a possibility to have a discount if we will use directly a certain token. If that happens, I will buy some gems in my game in order for my character to have a strong skills and armies.

it also already happened with Steam (Valve corp.) they are one of the biggest gaming platforms in the whole world with millions of players and they added bitcoin support but unfortunately last year they stopped it because the fees were very high!

maybe we can see that happening again in a year or so with Lightning Network and if we can accept the fact that bitcoin not being a currency is dumbest thing in the world...

People will not be attracted to buy bitcoin just because games accepted it as a payment. It will be more like people especially gamers who are using bitcoin will eventually be using bitcoin to pay games and game items.

As far as I know Steam accepted bitcoin but ceased accepting it because of it's volatility and high fees.

when we are talking about bitcoin's usage in some thing, two things are required.
first which is the most important step is the users' willingness to use bitcoin in that "thing" (online games here). if people don't want to spend their bitcoin at all, then adding it to an online game or gaming platform changes nothing and it won't happen in first place because there is no "demand for it". so we have to first see if there demand or not. and I think there is because Steam and the reports from BitPay support this.

second is the platforms willingness to add bitcoin. sometimes these places resist change and don't want to change what is good and working. their mind can change if they see the demand is high enough. again like Steam where the demand for bitcoin payment was pretty high so they gave in and started accepting bitcoin.

I think some new companies are already connecting blockchain technology/bitcoin to online games. I'm not only sure which. Well with the current trend of bitcoin and we can see that blockchain technology is the future, I believe that it will soon happen with famous online games. After all, gaming companies are also trying to apply emerging technologies to provide best gaming experience on gamers.

But it is a serious problem, at present most of the game equipment is not particularly expensive, so use bitcoin need to afford the expensive fee, so it is not suitable to use bitcoin as purchase game equipment.

There are some now, and it happens now, buying online game items using bitcoin as a payment. And this will be good for bitcoin, because many gamers now is buying online items, items in online games. This will help bitcoin a lot.