It's something that does concern me, as there are so many different factors contributing to the lack of new investors and/or current investors losing interest. I wrote an article on the topic a while back, so here's the link. I think it covers the vast majority of causes, but I'm sure there's more, so feel free to add a point or correct me on my assumptions.

https://steemit.com/bitcoin/@cryptothief/the-average-joe-s-main-concerns-about-bitcoin-why-don-t-they-invest

No. There is no need for 'Bitcoin' to be taught in schools, not as a compulsory subject anyway, there are plenty of other outlets which offer education in the field which can be accessed by those that are interested, often at little to no cost. I would much rather my children got educated in languages, history, science etc., but that's just me. I'm talking about younger children though, if you're talking 16+, then it would be good to have courses available for those that were interested.

Think the basic answer to this question has already been given above, but just wanted to add a couple of things. Gone are the days when projects were hitting hard caps on a regular basis, which basically meant there would be almost guaranteed demand when it hit the exchanges. Now it seems to be a struggle for even the most promising projects to reach their soft caps, and this invariably ends with the coin/token being listed at below the ICO price. I tend to avoid investing in any ICOs now, but I do keep an eye on projects that interest me, as sometimes I can pick them up at a much cheaper price on an exchange. Not hitting a hard cap is not necessarily a bad thing, as long as the project has enough working capital, then enough progress should be made to bring them to the next level of investment. It actually helps to pinpoint projects which have little to no use, a key ingredient for potential investors.

There is a real opportunity at the moment to get in on projects that had jumped beyond a reasonable price. As with any investment though, there is no point going in blindly based on the fact that it has dropped by a huge amount. Some of these drops may be more deserved than the market implies, whereas others may have suffered unfairly and just been dragged down by general sentiment. I have a list of around 5 or 6 that I am still hoping to get in on, but they haven't fallen to my buying range yet. Still think there will be another drop before the overall markets improve, so waiting for that.

You can't really judge the overall market in two halves, there's a lot more to the question about whether a coin or token has more value. There are plenty of coins out there which either currently, or probably in the near future, hold almost no value; whereas there are some tokens out there, especially security tokens, which look to be great investments. There are pros and cons to each, so I definitely won't be judging any based on the simple fact of whether they are tokens or coins.

I'm confused, the World Cup in Russia finished almost 6 weeks before you posted this. Did you mean are football clubs in general accepting Bitcoin? If so, I have no clue about the Russian league; but I read recently that some Premier League clubs have signed a deal with eToro, and wouldn't be surprised if more were on the way, both in England and worldwide.

https://www.telegraph.co.uk/football/2018/08/20/premier-league-clubs-trial-cryptocurrency-experts-predict-bitcoins/

Not sure I agree with your statement, holding different altcoins (especially if they are focused on different industries) is, in my opinion anyway, diversification. Whether that is the right choice is another matter, and I agree it will potentially dilute your returns. It ultimately depends on your attitude to risk, and true diversification should involve multiple investment avenues including property, bonds, stocks, crypto etc. Anyway, we're talking crypto here, so here's my take on it.

If you had invested equal amounts in the top ten currencies this time last year (as of September 10th 2017 - see below), you would have a overall loss of just over 5%. It obviously doesn't tell the whole story though, because the market has been on a roller-coaster ride since then. What is obvious is the relative risk/reward of not doing that - as if you picked one coin, then you would now be looking at a portfolio with losses of over 60% if you'd picked the 'wrong' coin, or gains of over 50% if you'd picked the 'right' one.
                           
1. Bitcoin - $4083.7 (6403.89) +56.82%
2. Ethereum - $281.75 (203.26) -27.86%
3. Bitcoin Cash - $515.77 (484.90) -5.99%
4. XRP - $0.20403 (0.286568) +40.45%
5. Litecoin - $61.48 (55.40) -9.89%                             
6. Dash - $309.32 (197.71) -36.08%     
7. NEM - $0.254176 (0.10019) -60.58%           
8. Monero - $109.66 (106.15) -3.20%   
9. IOTA - $0.517025 (0.564325) +9.15%         
10. Ethereum Classic - $13.78 (11.47) -16.76%

Anyway, each to their own.