if you visit the Bitcoin thread, in this post, I posted an info-graphic from April of last year that lists many of the retailers who readily accept crypto. granted it is far from being accepted at every gas station as yet but as you will see, it is becoming widely accepted. more so as each day passes. it is the future, a natural evolution of where we are. most of your fiat today is already digital and moving more in that direction as each day passes as well.
there are Stablecoins which are directly tied to fiat that are, as the moniker states, more stable in their held value.
yes and no.
with the evolution of the 7nm chip you can now mine at a profit with today's prices. 28/TH's @ 57 J/T. the profit margin is barely there but it is there at this level of Difficulty.