I think the ability to easily move into and out of Fiat is one of the main things that will help this (or any) crypto in terms of adoption. It only makes sense. Non crypto people don't care about the principles like we do, they just want it to be easy and benefit them.
It is our duty to make that happen.
Ease of use is certainly one of the things that are slowing progress. I even find it when I go onto a new wallet or platform. It takes time to search around to get the hang of things.
Converting from fiat is still vital since most do not have crypto. I believe, at some point, it will be secondary but not until there are 500M or 1B with crypto. Until then, people will still be operating mostly in fiat.