Haha, value is our believe, nothing less nothing more. Dollar is valuable because so many people believe in US government. The same thing with every coin.
New users is not a problem. They come, they compare and they make their choice.
And yes, you already can buy goods and services with crypto. As Andreas Antonopoulos said, money is a language, It allows us to talk about value.
Yes. But they still need to figure out a way to get coins. And if there is no crypto<->fiat interface, they have to finde other ways.
That's why I think the future model is giving coins for free (initial distribution). Or through airdrop.
Think about it in another way: why we need to buy money? Do we buy dollars/euros/yenes?
Ahhh ... I see. Airdrop / Free Distribution could be a model.