Probably stating the obvious, but just because each full bitcoin is over $4000 doesn't mean you need to be rich. It doesn't change the price of items you purchase, so you just spend smaller fractions of each coin for each burger/hotel room/computer part.
If anything, the increasing price of btc (up to a point/limit) means that the consumer items are getting progressively cheaper, which would benefit both the rich and the poor.
I agree. I have started asking to be paid in BTC for some things as well. The great part about it is that you don't need to actually buy BTC to get started in BTC. People who can't afford a $4k BTC can sell things for fractions or request that payment for services are in BTC.