Having USD universally available outside of US would be a huge deal for many people in the world. USD is more stable than most of other currencies, so that would be a clear win for people in Africa, parts of Asia, etc. Some people just can't afford going cold turkey into BTC. If you live off a business with thin margins and you would go BTC only, then the current volatility of BTC can make you bankrupt/insolvent in a day...

Essentially enabling the world to have actually stable stablecoin is moving from 0 to 1. It makes it much easier to jump from 1 to 100 by moving to Bitcoin later :)