Can you stop calling Bitcoin an investment?

This damages the cryptocurrency. Bitcoin was not created to become an investment. Before Bitcoin, there were some digital currencies years back, the goal was always to be able to create a (digital) currency free from central banks and governments.
Cypherpunks and other anarcho-capitalists are at the origin of this idea, perhaps 20 or 30 years ago. None were intended to make an investment to be rich quickly.
You won't find in the white paper "investing" mentioned, you won't find any post from Satoshi mentioning it

Considering Bitcoin as an investment, this is the reason why we have more and more regulations, G20 summits and others craps, KYC, etc...
The word "Crypto-assets" didn't exist before, why did they create it? Because you even consider it an investment, then why shouldn't they?
Bitcoin could be a lot more accepted and used by now. Why should a merchant agree to be paid in Bitcoin? He wants money, not a piece of your investment.

You're not even investing, you are just gambling with money.
Go to the altcoins board, you will surely find plenty of ICOs where you can say you invested in. I have something for you, ICOs used to raise money are no different than "Crowdfunding". If you want to invest then there are a lot of Crowdfunding websites where you can invest in real startups with fewer risks, (you won't find any project using photos from Pixabay...)

Why don't we see cryptographers anymore? Guess the reasons

You don't even need a computer to mine Bitcoins. Just use a pen and a paper:
http://www.righto.com/2014/09/mining-bitcoin-with-pencil-and-paper.html

I'm still very confident with my prediction, and I hope bitcoin will be able to actually go at the $ 50000 price for this year.

CBOE-the world's top player has applied for an ETF. This company offered the insurance of their ETF for investors.
If the SEC approves the bid, it will be a huge breakthrough for the crypt.