In the long run, all major businesses will have to use blockchain. The bigger question is when will this happen, with which technology and to what extent.

More people are selling than are buying.
Yes, within 10 years.

If cryptocurrency continues to grow, it is likely that the United States government will subpoena exchanges for information about their customers and find out who has and who has not been paying their fair share of taxes. They've already started trending in this direction and will likely continue to further their efforts in the near and distant future.

A large portion of the market is controlled by a few hands. So yes, this is a thing that will happen in unregulated markets. It's both a strength and a weakness of getting involved in cryptocurrencies.

There are so many ways and they largely revolve around a few factors: Your intelligence, access to capital, connections, quality/length of work and quality of idea. You don't need all of those boxes checked, but the more you have the more you will likely succeed.

You can start an entirely new project, get involved in ICOs, do long or short term investing and many other areas (for example, check out the securities subforum).

If you spend enough time in crypto you'll certainly come across a project that solves a problem in today's economy that you could pursue. With the right level of power, aptitude and luck behind anything, there's very little stopping anyone from becoming a millionaire these days.

You'll frequently want to identify very strong projects and preferably get in during pre-sale to obtain the best rates. This is often times done by a lot of research, large amounts of capital and value adds (marketing, security solutions and others).

Otherwise, you can just simply buy any project at market when they come out if you want a simple and cheap way of being involved.

I would suggest looking at the weekly round up by www.coincentral.com. Great resource in general.