Bitcoin is one of the first if not the first cryptocurrency to rise. It has been considered as an asset by many people. It is true that some people believe too much in it and say that the government will adopt something decentralised as the Bitcoin, which is unlikely to ever happen. You can search up the details on Google. The articles there will be helpful for you.

Yes it is a good idea too raise awarness about the dead coins. Many investors mostly newbies unknowingly investing in these coins. It is very important to gather all kinds of information before investing in a coin.

In theory by that time if the last Bitcoin is mined there will probably be a coin that was in line to come up at the top in that aspect as we'd see this new coin be the new Bitcoin in terms of minability and value. But by 2140 who knows if there's something that tops cryptocurrency? we never thought we'd see cryptocurrency as a possibility until 2009. The reason why speculating about the potential of what would be is something not really worth the trouble. There might be advancements that even make this obsolete, who knows?

POS interest usually means if you're using your tokens while staking it to the network you will get a little interest from the network. Since you're new to using POS I'd advise you to read an article or two on POS as that will help you get a grasp of the bigger picture considering if you're investing your time into something it's best to study up on it in order to get the most results from working on it.

Most ICOs nowadays don't have a strong leader nor a good development team in order to voice their idea, give the investors a proper idea for their direction they wanna take and the overall strength of the team that they can make it happen. If you're gonna leave it all up to the investors without any sign of how the progress is going it is obvious that people won't be keen on investing and help reach the cap. If these new ICOs that are actually good have a better plan of execution they can succeed in the market and not be overshadowed by these scam ICOs that are giving a bad reputation to the market.

Bitcoin prices are higher than ever and it is growing with each year and becoming more stable. As you're new you think of this as low because you do know have prior knowledge to the market and how it has come to this point. With each year most of the people who've been a part of the crypto market are already aware that this is rather normal and what would improve the situation of the market even further is the inevitable bull in the market. With time we all expect to see great results.

Since the release of Bitcoin back in 2009 to 2018 it has been a bull, it had no value in the beginning, now it does. People invest in crypto for the potential of profit which is very apparent by now. There are new investors who have wishful thinking for a boost in the market to sell as soon as possible for a quick profit and those who know the potential for the future. Also don't confuse Altcoins with Bitcoins. Something like Bitcoins has additional utilities and because of it the price isn't pure speculation.