ETH will allow $2T of underground economy to become more structured (and possibly less underground) through DAOs.
http://www.washingtonpost.com/blogs/wonkblog/wp/2013/04/23/americas-2-trillion-shadow-economy-is-the-recessions-big-winner/

If it captures 1% of that $2T, it is equivalent to $20B, which would put ETH somewhere around $150. Those who sell for $2 will shit bricks, eat sand and may even commit suicide in the years to come. If it captures 10% of that ETH will be $1500. I know it sounds crazy, but so did the Internet in 1995.

Once it's launched their main focus will be on scalability, which I think is the real reason crypto is not ready for mainstream. Once they can handle 100K TPS (and I'm sure they will), it's game over.

Many countries seem to have a hard time defining and regulating Bitcoin. The current legal framework is not enough to deal with cryptocurrency revolution, thus most countries still have not considered Bitcoin to be an additional legal tender just like the function of their central bank issued fiat money.

However, the Bitcoin revolution is fast reaching the nooks and crannies of many countries all over the world, what with the use of the modern gadgets and the internet. Sooner or later, financial authorities have to come up with the necessary framework with which cryptocurrency can work with.

For now, let us just enjoy the "not yet legal but not banned" status which can anyway fine with me so I can still avoid paying taxes.