To understand the value of bitcoin, we start with the basic value of money, which is also money.
Money is the most common and effective mutual trust system ever. In any form of currency, its value is essentially: "does anyone believe" why the dollar is the most valuable? Because the world believes in it.
The popularity of bitcoin has grown rapidly in recent years with the development of the Internet. I predict that the price of bitcoins in 10 years should be more than half a million dollars.
I do not see a valuation getting to million dollars even in ten years time, since you talked about dollars being valuable, how you evaluate things, does price gives you the ultimate answer for its valuation, if that is the case dollars is not the most valued in the forex market as there are other currencies with much higher valuations. There are thousands of alt coins in the market and if we only had bitcoin it could have touched the million mark but since there are plenty of other coins i find it hard to see those valuations even with ten years time.