Actually the dollar is in no way tied to digital currency. I don't own bitcoin, I own Eth. It is a digital currency like Bitcoin, but is also a system that other things can ride on (Like tax data for governmental taxing as an example.) in the block chain world.
Large corporations are buying in on a massive scale.
I have a co worker that bought Eth when it was 30 cents, 600 bucks worth. When it went from 30 cents to 40 dollars, I bought $1000. At 100 I bought more alt coins. They are now, at this minute, worth 2600 bucks a piece. My co worker with 30 cent Eth? Today was worth in excess of 4 million.
I watched Bitcoin from back when it was 25 dollars. Recently, it was over 60,000.
Make no mistake, this is no joke or pie in the sky. Countries whose currency has crashed, it's great. I can hold a fortune in a small nano ledger, a thumb drive device with a mini screen on it. It can be lost or destroyed, I can restore portfolio. No one can get to it, totally safe in there.
One big thing, this is no different to the IRS than any other trading of commodities or stocks, each sale creates a taxable event, although (well, under current tax law, who knows for how long) after holding over one year is a long term capital taxable at 15% at least! Even Turbo tax includes info on digital coin sales now. I like cash, but this digital stuff is crazy.
More and more merchants around the world will take payment in digital currency. Also most exchanges you can buy other alt coins with Eth or Bitcoin and so forth.
The only other thing I trust is gold and silver, the metal itself in my possession!
Bubba