1. do you think de-dollarization will make more people and country adopt Bitcoin?
No.
2. what do you think is the biggest thing stopping Bitcoin from playing a bigger role in the global economy?
In order to become a global asset, first of all, it is necessary to become a neutral asset. There are two obstacles to this. The vast majority of miners are in the US jurisdiction; the vast majority of coin holders are located there. Thus, it is primarily an American asset. Why is that? - You may ask. Because the government can put legal, political, or fiscal pressure on both miners and asset owners. And this will definitely affect the asset itself. For example, it affects price, accessibility, prohibitions, etc.
The second obstacle is more serious. Globalism is over. And with it, the global financial system is dying. Wallerstein predicted this in the early 90s, that is, more than 30 years ago. By the way, he predicted the destruction of the USSR and the restoration of capitalism back in the 70s, when no one believed in it. So his predictions are not empty words.