There is saying that goes something like "Capitalism is the worst system, except for all the others." That means something like, sometimes we just don't have a better solution. POW is bad for the environment, and keeps regular users away from mining, but I can't imagine a better system for security.

I don't know if there will ever be a point where more than a minority of users will be miners, so I don't necessarily agree this this is a problem warranting a solution. Look up the Pareto distribution and you will see that it is universal that the minority of participants will do all of the work and reap all of the reward.

No, I think Bitcoin still the biggest one, as you can see in the market, bitcoin still in the top one, after that continue with Eth and others

Yeah sure. Some coins are actually better investments than BTC, bitcoin isn't the number 1 in that part. But that doesn't make bitcoin incompetitive in the field. That's just futile. BTC is still the pioneer crypto. And it's still far off on being thrown away from that throne. True, come altcoins are better at increasing value, but you're not sure bout the longetivity of that coin. Many altcoins have grown so fast and fall too fast already. But bitcoin already have stable backers and conitnuously growing. I think you're just asking which coins to better profit, and quick money. Investing is all about patience, lad.

Bitcoin is a king of crypto-currency market and all coin are depends on bitcoin.Few days bitcoin down and crypto market down also so without bitcoin crypto market will be dead.Now agian bitcoin price pumping and most powerfull altcoin also pumping but we know that bitcoin pump altcoin dump and bitcoin dump altcoin dump and bitcoin stable altcoin on the moon.

We can actually see this. Indeed in the past few months, bitcoin has become very slow in price growth and very slow in performing its normal functions because of which it can not fully perform the function of a payment facility. Some altcoins, on the contrary, improve and become real competition to it. If bitcoin does not eliminate his own shortcomings, he may well lose his place as a leader. It will be solved in just a few months.

Possible that there will be coins move faster than bitcoin with respect to the price and popularity but it couldn't be the main coin. To move faster than bitcoin doesn't mean it will be the main coin or the leading coin in the future era. Maybe it can make bitcoin popularity growth but the main role of bitcoin couldn't be.

I think the BTC is still the reserve currency.
It may be that some coins move a bit better in the short term, but in the longer term, the BTC is the stable currency.

The crypto currencies will all remain very volatile

Bitcoin continues to have first mover advantage and wins the perception game.  However, altcoins, when backed by a substantial existing business, can move very quick.  Check out the ICO for RLCoin, an enterprise solution for loyalty: www.rlcoin.io.  The product has traction with 250 clients and partners in Europe and Asia.

Yes other coins do move or what you can say circulate at a faster pace than these coins but if we talk about the long term progress then there is none other option worth availing than the Btcs because even if they are slow due to limited supply but they are more beneficial than the other coins.

I could mark the basic reason behind this fact and that is even the bitcoin prices do fluctuate like the other cons but the fluctuation itself is the real landmark behind its success.

Altcoins prices grow very fast when it is on the first stage of its existence. Then we see the short-term sharp rise. After there is a moderate growth. This is best option. Most altcoins go down after the period of going up.