All those FUDsters that where saying year ago how Bitcoin would fail because another currency would take over get proven wrong year after year. The more time Bticoin is alive, the stronger it gets and the bigger the network effect. Sorry but there will not be a Bitcoin 2.0. Bitcoin will go to 100k+ per coin in the next 5 to 10 years, it will absorb all the value researched in the field if not directly through protocol improvements then through sidechains.

Bitcoin will remain the only solid coin. The only coin that survived for the longest time (other coins can't claim this unless they invent a time machine).
There will be alts that pump really hard and make people millionaires, but no alt is going to surpass Bitcoin's strength and solidity. No coin will get a bigger marketcap. In the long term people holding 21+ BTC will be rewarded by history with rich-tier status for seeing the value in it before most people did. Do not let the FUDsters trick your mind or the trolls try to derrail the excellent job being done by Core devs.

Let's continue then our path towards inevitable triumph.

That is not the case. Think of Ethereum for example, a smart contracts-based digital currency, which has grown exponentially during the last couple of months.

Bitcoin has been steadily losing market cap dominance, from 90%+ just two years ago to ~80% today.

When it comes to exchange dominance it's just 66.4%.

This trend will probably continue and in a few years there will be people using cryptocurrencies that do not know what bitcoin is.

I would say otherwise. Bitcoin has a lot of competition due to altcoins like Ethereum, monero, dash, litecoin and doge. Also news coins are popping up every week.

Due to these altcoins, the investments are getting divided. If all of the online investments are flown in to bitcoin, it would have reached 2k USD mark by now. But due to the immense competition from the altcoins, it is still at $580 level.

I agree, I don't see a single coin conquering BTC's marketcap. The only damage that can be done to BTC is throught anonymous coins, but if everything goes as expected, in a year or two (hopefully quicker) we will have ways to make bitcoin way more anonymous.